Adds most of the toolsHEADmaster

1 files changed, 2322 insertions, 0 deletions

diff --git a/v_windows/v/old/vlib/regex/regex.v b/v_windows/v/old/vlib/regex/regex.v
new file mode 100644
index 0000000..12e86da
--- /dev/null
+++ b/v_windows/v/old/vlib/regex/regex.v
@@ -0,0 +1,2322 @@
+/*
+regex 1.0 alpha
+
+Copyright (c) 2019-2021 Dario Deledda. All rights reserved.
+Use of this source code is governed by an MIT license
+that can be found in the LICENSE file.
+
+This file contains regex module
+
+Know limitation:
+- find is implemented in a trivial way
+- not full compliant PCRE
+- not compliant POSIX ERE
+*/
+module regex
+
+import strings
+
+pub const (
+	v_regex_version        = '1.0 alpha' // regex module version
+
+	max_code_len           = 256 // default small base code len for the regex programs
+	max_quantifier         = 1073741824 // default max repetitions allowed for the quantifiers = 2^30
+	// spaces chars (here only westerns!!) TODO: manage all the spaces from unicode
+	spaces                 = [` `, `\t`, `\n`, `\r`, `\v`, `\f`]
+	// new line chars for now only '\n'
+	new_line_list          = [`\n`, `\r`]
+
+	// Results
+	no_match_found         = -1
+
+	// Errors
+	compile_ok             = 0 // the regex string compiled, all ok
+	err_char_unknown       = -2 // the char used is unknow to the system
+	err_undefined          = -3 // the compiler symbol is undefined
+	err_internal_error     = -4 // Bug in the regex system!!
+	err_cc_alloc_overflow  = -5 // memory for char class full!!
+	err_syntax_error       = -6 // syntax error in regex compiling
+	err_groups_overflow    = -7 // max number of groups reached
+	err_groups_max_nested  = -8 // max number of nested group reached
+	err_group_not_balanced = -9 // group not balanced
+	err_group_qm_notation  = -10 // group invalid notation
+)
+
+const (
+	//*************************************
+	// regex program instructions
+	//*************************************
+	ist_simple_char    = u32(0x7FFFFFFF) // single char instruction, 31 bit available to char
+	// char class 11 0100 AA xxxxxxxx
+	// AA = 00  regular class
+	// AA = 01  Negated class ^ char
+	ist_char_class     = 0xD1000000 // MASK
+	ist_char_class_pos = 0xD0000000 // char class normal [abc]
+	ist_char_class_neg = 0xD1000000 // char class negate [^abc]
+	// dot char        10 0110 xx xxxxxxxx
+	ist_dot_char       = 0x98000000 // match any char except \n
+	// backslash chars 10 0100 xx xxxxxxxx
+	ist_bsls_char      = 0x90000000 // backslash char
+	// OR |            10 010Y xx xxxxxxxx
+	ist_or_branch      = 0x91000000 // OR case
+	// groups          10 010Y xx xxxxxxxx
+	ist_group_start    = 0x92000000 // group start (
+	ist_group_end      = 0x94000000 // group end   )
+	// control instructions
+	ist_prog_end       = u32(0x88000000) // 10 0010 xx xxxxxxxx
+		//*************************************
+)
+
+/*
+General Utilities
+*/
+// utf8util_char_len calculate the length in bytes of a utf8 char
+[inline]
+fn utf8util_char_len(b byte) int {
+	return ((0xe5000000 >> ((b >> 3) & 0x1e)) & 3) + 1
+}
+
+// get_char get a char from position i and return an u32 with the unicode code
+[direct_array_access; inline]
+fn (re RE) get_char(in_txt string, i int) (u32, int) {
+	ini := unsafe { in_txt.str[i] }
+	// ascii 8 bit
+	if (re.flag & regex.f_bin) != 0 || ini & 0x80 == 0 {
+		return u32(ini), 1
+	}
+	// unicode char
+	char_len := utf8util_char_len(ini)
+	mut tmp := 0
+	mut ch := u32(0)
+	for tmp < char_len {
+		ch = (ch << 8) | unsafe { in_txt.str[i + tmp] }
+		tmp++
+	}
+	return ch, char_len
+}
+
+// get_charb get a char from position i and return an u32 with the unicode code
+[direct_array_access; inline]
+fn (re RE) get_charb(in_txt &byte, i int) (u32, int) {
+	// ascii 8 bit
+	if (re.flag & regex.f_bin) != 0 || unsafe { in_txt[i] } & 0x80 == 0 {
+		return u32(unsafe { in_txt[i] }), 1
+	}
+	// unicode char
+	char_len := utf8util_char_len(unsafe { in_txt[i] })
+	mut tmp := 0
+	mut ch := u32(0)
+	for tmp < char_len {
+		ch = (ch << 8) | unsafe { in_txt[i + tmp] }
+		tmp++
+	}
+	return ch, char_len
+}
+
+[inline]
+fn is_alnum(in_char byte) bool {
+	mut tmp := in_char - `A`
+	if tmp <= 25 {
+		return true
+	}
+	tmp = in_char - `a`
+	if tmp <= 25 {
+		return true
+	}
+	tmp = in_char - `0`
+	if tmp <= 9 {
+		return true
+	}
+	if tmp == `_` {
+		return true
+	}
+	return false
+}
+
+[inline]
+fn is_not_alnum(in_char byte) bool {
+	return !is_alnum(in_char)
+}
+
+[inline]
+fn is_space(in_char byte) bool {
+	return in_char in regex.spaces
+}
+
+[inline]
+fn is_not_space(in_char byte) bool {
+	return !is_space(in_char)
+}
+
+[inline]
+fn is_digit(in_char byte) bool {
+	tmp := in_char - `0`
+	return tmp <= 0x09
+}
+
+[inline]
+fn is_not_digit(in_char byte) bool {
+	return !is_digit(in_char)
+}
+
+[inline]
+fn is_wordchar(in_char byte) bool {
+	return is_alnum(in_char) || in_char == `_`
+}
+
+[inline]
+fn is_not_wordchar(in_char byte) bool {
+	return !is_alnum(in_char)
+}
+
+[inline]
+fn is_lower(in_char byte) bool {
+	tmp := in_char - `a`
+	return tmp <= 25
+}
+
+[inline]
+fn is_upper(in_char byte) bool {
+	tmp := in_char - `A`
+	return tmp <= 25
+}
+
+pub fn (re RE) get_parse_error_string(err int) string {
+	match err {
+		regex.compile_ok { return 'compile_ok' }
+		regex.no_match_found { return 'no_match_found' }
+		regex.err_char_unknown { return 'err_char_unknown' }
+		regex.err_undefined { return 'err_undefined' }
+		regex.err_internal_error { return 'err_internal_error' }
+		regex.err_cc_alloc_overflow { return 'err_cc_alloc_overflow' }
+		regex.err_syntax_error { return 'err_syntax_error' }
+		regex.err_groups_overflow { return 'err_groups_overflow' }
+		regex.err_groups_max_nested { return 'err_groups_max_nested' }
+		regex.err_group_not_balanced { return 'err_group_not_balanced' }
+		regex.err_group_qm_notation { return 'err_group_qm_notation' }
+		else { return 'err_unknown' }
+	}
+}
+
+// utf8_str convert and utf8 sequence to a printable string
+[inline]
+fn utf8_str(ch rune) string {
+	mut i := 4
+	mut res := ''
+	for i > 0 {
+		v := byte((ch >> ((i - 1) * 8)) & 0xFF)
+		if v != 0 {
+			res += '${v:1c}'
+		}
+		i--
+	}
+	return res
+}
+
+// simple_log default log function
+fn simple_log(txt string) {
+	print(txt)
+}
+
+/******************************************************************************
+*
+* Token Structs
+*
+******************************************************************************/
+pub type FnValidator = fn (byte) bool
+
+struct Token {
+mut:
+	ist rune
+	// char
+	ch     rune // char of the token if any
+	ch_len byte // char len
+	// Quantifiers / branch
+	rep_min int  // used also for jump next in the OR branch [no match] pc jump
+	rep_max int  // used also for jump next in the OR branch [   match] pc jump
+	greedy  bool // greedy quantifier flag
+	// Char class
+	cc_index int = -1
+	// counters for quantifier check (repetitions)
+	rep int
+	// validator function pointer
+	validator FnValidator
+	// groups variables
+	group_rep int // repetition of the group
+	group_id  int = -1 // id of the group
+	goto_pc   int = -1 // jump to this PC if is needed
+	// OR flag for the token
+	next_is_or bool // true if the next token is an OR
+	// dot_char token variables
+	dot_check_pc  int = -1 // pc of the next token to check
+	last_dot_flag bool // if true indicate that is the last dot_char in the regex
+}
+
+[inline]
+fn (mut tok Token) reset() {
+	tok.rep = 0
+}
+
+/******************************************************************************
+*
+* Regex struct
+*
+******************************************************************************/
+pub const (
+	f_nl  = 0x00000001 // end the match when find a new line symbol
+	f_ms  = 0x00000002 // match true only if the match is at the start of the string
+	f_me  = 0x00000004 // match true only if the match is at the end of the string
+
+	f_efm = 0x00000100 // exit on first token matched, used by search
+	f_bin = 0x00000200 // work only on bytes, ignore utf-8
+	// behaviour modifier flags
+	f_src = 0x00020000 // search mode enabled
+)
+
+struct StateDotObj {
+mut:
+	i                 int = -1 // char index in the input buffer
+	pc                int = -1 // program counter saved
+	mi                int = -1 // match_index saved
+	group_stack_index int = -1 // continuous save on capturing groups
+}
+
+pub type FnLog = fn (string)
+
+pub struct RE {
+pub mut:
+	prog     []Token
+	prog_len int // regex program len
+	// char classes storage
+	cc       []CharClass // char class list
+	cc_index int // index
+	// groups
+	group_count      int   // number of groups in this regex struct
+	groups           []int // groups index results
+	group_max_nested int = 3 // max nested group
+	group_max        int = 8 // max allowed number of different groups
+
+	state_list []StateObj
+
+	group_csave_flag bool  // flag to enable continuous saving
+	group_csave      []int //= []int{}  // groups continuous save list
+
+	group_map map[string]int // groups names map
+
+	group_stack []int
+	group_data  []int
+	// flags
+	flag int // flag for optional parameters
+	// Debug/log
+	debug    int    // enable in order to have the unroll of the code 0 = NO_DEBUG, 1 = LIGHT 2 = VERBOSE
+	log_func FnLog = simple_log // log function, can be customized by the user
+	query    string // query string
+}
+
+// Reset RE object
+[direct_array_access; inline]
+fn (mut re RE) reset() {
+	re.cc_index = 0
+
+	mut i := 0
+	for i < re.prog_len {
+		re.prog[i].group_rep = 0 // clear repetition of the group
+		re.prog[i].rep = 0 // clear repetition of the token
+		i++
+	}
+
+	// init groups array
+	if re.group_count > 0 {
+		re.groups = []int{len: re.group_count * 2, init: -1}
+	}
+
+	// reset group_csave
+	if re.group_csave_flag == true {
+		re.group_csave.clear() // = []int{}
+	}
+
+	// reset state list
+	re.state_list.clear()
+	re.group_stack.clear()
+}
+
+// reset for search mode fail
+// gcc bug, dont use [inline] or go 5 time slower
+//[inline]
+[direct_array_access]
+fn (mut re RE) reset_src() {
+	mut i := 0
+	for i < re.prog_len {
+		re.prog[i].group_rep = 0 // clear repetition of the group
+		re.prog[i].rep = 0 // clear repetition of the token
+		i++
+	}
+}
+
+/******************************************************************************
+*
+* Backslashes chars
+*
+******************************************************************************/
+struct BslsStruct {
+	ch        rune        // meta char
+	validator FnValidator // validator function pointer
+}
+
+const (
+	bsls_validator_array = [
+		BslsStruct{`w`, is_alnum},
+		BslsStruct{`W`, is_not_alnum},
+		BslsStruct{`s`, is_space},
+		BslsStruct{`S`, is_not_space},
+		BslsStruct{`d`, is_digit},
+		BslsStruct{`D`, is_not_digit},
+		BslsStruct{`a`, is_lower},
+		BslsStruct{`A`, is_upper},
+	]
+
+	// these chars are escape if preceded by a \
+	bsls_escape_list     = [`\\`, `|`, `.`, `:`, `*`, `+`, `-`, `{`, `}`, `[`, `]`, `(`, `)`, `?`,
+		`^`, `!`]
+)
+
+enum BSLS_parse_state {
+	start
+	bsls_found
+	bsls_char
+	normal_char
+}
+
+// parse_bsls return (index, str_len) bsls_validator_array index, len of the backslash sequence if present
+fn (re RE) parse_bsls(in_txt string, in_i int) (int, int) {
+	mut status := BSLS_parse_state.start
+	mut i := in_i
+
+	for i < in_txt.len {
+		// get our char
+		char_tmp, char_len := re.get_char(in_txt, i)
+		ch := byte(char_tmp)
+
+		if status == .start && ch == `\\` {
+			status = .bsls_found
+			i += char_len
+			continue
+		}
+
+		// check if is our bsls char, for now only one length sequence
+		if status == .bsls_found {
+			for c, x in regex.bsls_validator_array {
+				if x.ch == ch {
+					return c, i - in_i + 1
+				}
+			}
+			status = .normal_char
+			continue
+		}
+
+		// no BSLS validator, manage as normal escape char char
+		if status == .normal_char {
+			if ch in regex.bsls_escape_list {
+				return regex.no_match_found, i - in_i + 1
+			}
+			return regex.err_syntax_error, i - in_i + 1
+		}
+
+		// at the present time we manage only one char after the \
+		break
+	}
+	// not our bsls return KO
+	return regex.err_syntax_error, i
+}
+
+/******************************************************************************
+*
+* Char class
+*
+******************************************************************************/
+const (
+	cc_null = 0 // empty cc token
+	cc_char = 1 // simple char: a
+	cc_int  = 2 // char interval: a-z
+	cc_bsls = 3 // backslash char
+	cc_end  = 4 // cc sequence terminator
+)
+
+struct CharClass {
+mut:
+	cc_type   int = regex.cc_null // type of cc token
+	ch0       rune        // first char of the interval a-b  a in this case
+	ch1       rune        // second char of the interval a-b b in this case
+	validator FnValidator // validator function pointer
+}
+
+enum CharClass_parse_state {
+	start
+	in_char
+	in_bsls
+	separator
+	finish
+}
+
+fn (re RE) get_char_class(pc int) string {
+	buf := []byte{len: (re.cc.len)}
+	mut buf_ptr := unsafe { &byte(&buf) }
+
+	mut cc_i := re.prog[pc].cc_index
+	mut i := 0
+	mut tmp := 0
+	for cc_i >= 0 && cc_i < re.cc.len && re.cc[cc_i].cc_type != regex.cc_end {
+		if re.cc[cc_i].cc_type == regex.cc_bsls {
+			unsafe {
+				buf_ptr[i] = `\\`
+				i++
+				buf_ptr[i] = byte(re.cc[cc_i].ch0)
+				i++
+			}
+		} else if re.cc[cc_i].ch0 == re.cc[cc_i].ch1 {
+			tmp = 3
+			for tmp >= 0 {
+				x := byte((re.cc[cc_i].ch0 >> (tmp * 8)) & 0xFF)
+				if x != 0 {
+					unsafe {
+						buf_ptr[i] = x
+						i++
+					}
+				}
+				tmp--
+			}
+		} else {
+			tmp = 3
+			for tmp >= 0 {
+				x := byte((re.cc[cc_i].ch0 >> (tmp * 8)) & 0xFF)
+				if x != 0 {
+					unsafe {
+						buf_ptr[i] = x
+						i++
+					}
+				}
+				tmp--
+			}
+			unsafe {
+				buf_ptr[i] = `-`
+				i++
+			}
+			tmp = 3
+			for tmp >= 0 {
+				x := byte((re.cc[cc_i].ch1 >> (tmp * 8)) & 0xFF)
+				if x != 0 {
+					unsafe {
+						buf_ptr[i] = x
+						i++
+					}
+				}
+				tmp--
+			}
+		}
+		cc_i++
+	}
+	unsafe {
+		buf_ptr[i] = byte(0)
+	}
+	return unsafe { tos_clone(buf_ptr) }
+}
+
+fn (re RE) check_char_class(pc int, ch rune) bool {
+	mut cc_i := re.prog[pc].cc_index
+	for cc_i >= 0 && cc_i < re.cc.len && re.cc[cc_i].cc_type != regex.cc_end {
+		if re.cc[cc_i].cc_type == regex.cc_bsls {
+			if re.cc[cc_i].validator(byte(ch)) {
+				return true
+			}
+		} else if ch >= re.cc[cc_i].ch0 && ch <= re.cc[cc_i].ch1 {
+			return true
+		}
+		cc_i++
+	}
+	return false
+}
+
+// parse_char_class return (index, str_len, cc_type) of a char class [abcm-p], char class start after the [ char
+fn (mut re RE) parse_char_class(in_txt string, in_i int) (int, int, rune) {
+	mut status := CharClass_parse_state.start
+	mut i := in_i
+
+	mut tmp_index := re.cc_index
+	res_index := re.cc_index
+
+	mut cc_type := u32(regex.ist_char_class_pos)
+
+	for i < in_txt.len {
+		// check if we are out of memory for char classes
+		if tmp_index >= re.cc.len {
+			return regex.err_cc_alloc_overflow, 0, u32(0)
+		}
+
+		// get our char
+		char_tmp, char_len := re.get_char(in_txt, i)
+		ch := byte(char_tmp)
+
+		// println("CC #${i:3d} ch: ${ch:c}")
+
+		// negation
+		if status == .start && ch == `^` {
+			cc_type = u32(regex.ist_char_class_neg)
+			i += char_len
+			continue
+		}
+
+		// minus symbol
+		if status == .start && ch == `-` {
+			re.cc[tmp_index].cc_type = regex.cc_char
+			re.cc[tmp_index].ch0 = char_tmp
+			re.cc[tmp_index].ch1 = char_tmp
+			i += char_len
+			tmp_index++
+			continue
+		}
+
+		// bsls
+		if (status == .start || status == .in_char) && ch == `\\` {
+			// println("CC bsls.")
+			status = .in_bsls
+			i += char_len
+			continue
+		}
+
+		if status == .in_bsls {
+			// println("CC bsls validation.")
+			for c, x in regex.bsls_validator_array {
+				if x.ch == ch {
+					// println("CC bsls found [${ch:c}]")
+					re.cc[tmp_index].cc_type = regex.cc_bsls
+					re.cc[tmp_index].ch0 = regex.bsls_validator_array[c].ch
+					re.cc[tmp_index].ch1 = regex.bsls_validator_array[c].ch
+					re.cc[tmp_index].validator = regex.bsls_validator_array[c].validator
+					i += char_len
+					tmp_index++
+					status = .in_char
+					break
+				}
+			}
+			if status == .in_bsls {
+				// manage as a simple char
+				// println("CC bsls not found [${ch:c}]")
+				re.cc[tmp_index].cc_type = regex.cc_char
+				re.cc[tmp_index].ch0 = char_tmp
+				re.cc[tmp_index].ch1 = char_tmp
+				i += char_len
+				tmp_index++
+				status = .in_char
+				continue
+			} else {
+				continue
+			}
+		}
+
+		// simple char
+		if (status == .start || status == .in_char) && ch != `-` && ch != `]` {
+			status = .in_char
+
+			re.cc[tmp_index].cc_type = regex.cc_char
+			re.cc[tmp_index].ch0 = char_tmp
+			re.cc[tmp_index].ch1 = char_tmp
+
+			i += char_len
+			tmp_index++
+			continue
+		}
+
+		// check range separator
+		if status == .in_char && ch == `-` {
+			status = .separator
+			i += char_len
+			continue
+		}
+
+		// check range end
+		if status == .separator && ch != `]` && ch != `-` {
+			status = .in_char
+			re.cc[tmp_index - 1].cc_type = regex.cc_int
+			re.cc[tmp_index - 1].ch1 = char_tmp
+			i += char_len
+			continue
+		}
+
+		// char class end
+		if status == .in_char && ch == `]` {
+			re.cc[tmp_index].cc_type = regex.cc_end
+			re.cc[tmp_index].ch0 = 0
+			re.cc[tmp_index].ch1 = 0
+			re.cc_index = tmp_index + 1
+
+			return res_index, i - in_i + 2, cc_type
+		}
+
+		i++
+	}
+	return regex.err_syntax_error, 0, u32(0)
+}
+
+/******************************************************************************
+*
+* Re Compiler
+*
+******************************************************************************/
+//
+// Quantifier
+//
+enum Quant_parse_state {
+	start
+	min_parse
+	comma_checked
+	max_parse
+	greedy
+	gredy_parse
+	finish
+}
+
+// parse_quantifier return (min, max, str_len, greedy_flag) of a {min,max}? quantifier starting after the { char
+fn (re RE) parse_quantifier(in_txt string, in_i int) (int, int, int, bool) {
+	mut status := Quant_parse_state.start
+	mut i := in_i
+
+	mut q_min := 0 // default min in a {} quantifier is 1
+	mut q_max := 0 // deafult max in a {} quantifier is max_quantifier
+
+	mut ch := byte(0)
+
+	for i < in_txt.len {
+		unsafe {
+			ch = in_txt.str[i]
+		}
+		// println("${ch:c} status: $status")
+
+		// exit on no compatible char with {} quantifier
+		if utf8util_char_len(ch) != 1 {
+			return regex.err_syntax_error, i, 0, false
+		}
+
+		// min parsing skip if comma present
+		if status == .start && ch == `,` {
+			q_min = 0 // default min in a {} quantifier is 0
+			status = .comma_checked
+			i++
+			continue
+		}
+
+		if status == .start && is_digit(ch) {
+			status = .min_parse
+			q_min *= 10
+			q_min += int(ch - `0`)
+			i++
+			continue
+		}
+
+		if status == .min_parse && is_digit(ch) {
+			q_min *= 10
+			q_min += int(ch - `0`)
+			i++
+			continue
+		}
+
+		// we have parsed the min, now check the max
+		if status == .min_parse && ch == `,` {
+			status = .comma_checked
+			i++
+			continue
+		}
+
+		// single value {4}
+		if status == .min_parse && ch == `}` {
+			q_max = q_min
+			status = .greedy
+			continue
+		}
+
+		// end without max
+		if status == .comma_checked && ch == `}` {
+			q_max = regex.max_quantifier
+			status = .greedy
+			continue
+		}
+
+		// start max parsing
+		if status == .comma_checked && is_digit(ch) {
+			status = .max_parse
+			q_max *= 10
+			q_max += int(ch - `0`)
+			i++
+			continue
+		}
+
+		// parse the max
+		if status == .max_parse && is_digit(ch) {
+			q_max *= 10
+			q_max += int(ch - `0`)
+			i++
+			continue
+		}
+
+		// finished the quantifier
+		if status == .max_parse && ch == `}` {
+			status = .greedy
+			continue
+		}
+
+		// check if greedy flag char ? is present
+		if status == .greedy {
+			if i + 1 < in_txt.len {
+				i++
+				status = .gredy_parse
+				continue
+			}
+			return q_min, q_max, i - in_i + 2, false
+		}
+
+		// check the greedy flag
+		if status == .gredy_parse {
+			if ch == `?` {
+				return q_min, q_max, i - in_i + 2, true
+			} else {
+				i--
+				return q_min, q_max, i - in_i + 2, false
+			}
+		}
+
+		// not  a {} quantifier, exit
+		return regex.err_syntax_error, i, 0, false
+	}
+
+	// not a conform {} quantifier
+	return regex.err_syntax_error, i, 0, false
+}
+
+//
+// Groups
+//
+enum Group_parse_state {
+	start
+	q_mark // (?
+	q_mark1 // (?:|P  checking
+	p_status // (?P
+	p_start // (?P<
+	p_end // (?P<...>
+	p_in_name // (?P<...
+	finish
+}
+
+// parse_groups parse a group for ? (question mark) syntax, if found, return (error, capture_flag, name_of_the_group, next_index)
+fn (re RE) parse_groups(in_txt string, in_i int) (int, bool, string, int) {
+	mut status := Group_parse_state.start
+	mut i := in_i
+	mut name := ''
+
+	for i < in_txt.len && status != .finish {
+		// get our char
+		char_tmp, char_len := re.get_char(in_txt, i)
+		ch := byte(char_tmp)
+
+		// start
+		if status == .start && ch == `(` {
+			status = .q_mark
+			i += char_len
+			continue
+		}
+
+		// check for question marks
+		if status == .q_mark && ch == `?` {
+			status = .q_mark1
+			i += char_len
+			continue
+		}
+
+		// non capturing group
+		if status == .q_mark1 && ch == `:` {
+			i += char_len
+			return 0, false, name, i
+		}
+
+		// enter in P section
+		if status == .q_mark1 && ch == `P` {
+			status = .p_status
+			i += char_len
+			continue
+		}
+
+		// not a valid q mark found
+		if status == .q_mark1 {
+			// println("NO VALID Q MARK")
+			return -2, true, name, i
+		}
+
+		if status == .p_status && ch == `<` {
+			status = .p_start
+			i += char_len
+			continue
+		}
+
+		if status == .p_start && ch != `>` {
+			status = .p_in_name
+			name += '${ch:1c}' // TODO: manage utf8 chars
+			i += char_len
+			continue
+		}
+
+		// colect name
+		if status == .p_in_name && ch != `>` && is_alnum(ch) {
+			name += '${ch:1c}' // TODO: manage utf8 chars
+			i += char_len
+			continue
+		}
+
+		// end name
+		if status == .p_in_name && ch == `>` {
+			i += char_len
+			return 0, true, name, i
+		}
+
+		// error on name group
+		if status == .p_in_name {
+			return -2, true, name, i
+		}
+
+		// normal group, nothig to do, exit
+		return 0, true, name, i
+	}
+	// UNREACHABLE
+	// println("ERROR!! NOT MEANT TO BE HERE!!1")
+	return -2, true, name, i
+}
+
+//
+// main compiler
+//
+// compile return (return code, index) where index is the index of the error in the query string if return code is an error code
+fn (mut re RE) impl_compile(in_txt string) (int, int) {
+	mut i := 0 // input string index
+	mut pc := 0 // program counter
+
+	// group management variables
+	mut group_count := -1
+	mut group_stack := []int{len: re.group_max_nested, init: 0}
+	mut group_stack_txt_index := []int{len: re.group_max_nested, init: -1}
+	mut group_stack_index := -1
+
+	re.query = in_txt // save the query string
+
+	i = 0
+	for i < in_txt.len {
+		mut char_tmp := u32(0)
+		mut char_len := 0
+		// println("i: ${i:3d} ch: ${in_txt.str[i]:c}")
+
+		char_tmp, char_len = re.get_char(in_txt, i)
+
+		//
+		// check special cases: $ ^
+		//
+		if char_len == 1 && i == 0 && byte(char_tmp) == `^` {
+			re.flag = regex.f_ms
+			i = i + char_len
+			continue
+		}
+		if char_len == 1 && i == (in_txt.len - 1) && byte(char_tmp) == `$` {
+			re.flag = regex.f_me
+			i = i + char_len
+			continue
+		}
+
+		// ist_group_start
+		if char_len == 1 && pc >= 0 && byte(char_tmp) == `(` {
+			// check max groups allowed
+			if group_count > re.group_max {
+				return regex.err_groups_overflow, i + 1
+			}
+			group_stack_index++
+
+			// check max nested groups allowed
+			if group_stack_index > re.group_max_nested {
+				return regex.err_groups_max_nested, i + 1
+			}
+
+			tmp_res, cgroup_flag, cgroup_name, next_i := re.parse_groups(in_txt, i)
+
+			// manage question mark format error
+			if tmp_res < -1 {
+				return regex.err_group_qm_notation, next_i
+			}
+
+			// println("Parse group: [$tmp_res, $cgroup_flag, ($i,$next_i), '${in_txt[i..next_i]}' ]")
+			i = next_i
+
+			if cgroup_flag == true {
+				group_count++
+			}
+
+			// calculate the group id
+			// if it is a named group, recycle the group id
+			// NOTE: **** the group index is +1 because map return 0 when not found!! ****
+			mut group_id := group_count
+			if cgroup_name.len > 0 {
+				// println("GROUP NAME: ${cgroup_name}")
+				if cgroup_name in re.group_map {
+					group_id = re.group_map[cgroup_name] - 1
+					group_count--
+				} else {
+					re.group_map[cgroup_name] = group_id + 1
+				}
+			}
+
+			group_stack_txt_index[group_stack_index] = i
+			group_stack[group_stack_index] = pc
+
+			re.prog[pc].ist = u32(0) | regex.ist_group_start
+			re.prog[pc].rep_min = 1
+			re.prog[pc].rep_max = 1
+
+			// set the group id
+			if cgroup_flag == false {
+				// println("NO CAPTURE GROUP")
+				re.prog[pc].group_id = -1
+			} else {
+				re.prog[pc].group_id = group_id
+			}
+
+			pc = pc + 1
+			continue
+		}
+
+		// ist_group_end
+		if char_len == 1 && pc > 0 && byte(char_tmp) == `)` {
+			if group_stack_index < 0 {
+				return regex.err_group_not_balanced, i + 1
+			}
+
+			goto_pc := group_stack[group_stack_index]
+			group_stack_index--
+
+			re.prog[pc].ist = u32(0) | regex.ist_group_end
+			re.prog[pc].rep_min = 1
+			re.prog[pc].rep_max = 1
+
+			re.prog[pc].goto_pc = goto_pc // PC where to jump if a group need
+			re.prog[pc].group_id = re.prog[goto_pc].group_id // id of this group, used for storing data
+
+			re.prog[goto_pc].goto_pc = pc // start goto point to the end group pc
+			// re.prog[goto_pc].group_id = group_count         // id of this group, used for storing data
+
+			pc = pc + 1
+			i = i + char_len
+			continue
+		}
+
+		// ist_dot_char match any char except the following token
+		if char_len == 1 && pc >= 0 && byte(char_tmp) == `.` {
+			re.prog[pc].ist = u32(0) | regex.ist_dot_char
+			re.prog[pc].rep_min = 1
+			re.prog[pc].rep_max = 1
+			pc = pc + 1
+			i = i + char_len
+			continue
+		}
+
+		// OR branch
+		if char_len == 1 && pc > 0 && byte(char_tmp) == `|` {
+			// two consecutive ist_dot_char are an error
+			if pc > 0 && re.prog[pc - 1].ist == regex.ist_or_branch {
+				return regex.err_syntax_error, i
+			}
+			re.prog[pc].ist = u32(0) | regex.ist_or_branch
+			pc = pc + 1
+			i = i + char_len
+			continue
+		}
+
+		// Quantifiers
+		if char_len == 1 && pc > 0 {
+			mut quant_flag := true
+			match byte(char_tmp) {
+				`?` {
+					// println("q: ${char_tmp:c}")
+					re.prog[pc - 1].rep_min = 0
+					re.prog[pc - 1].rep_max = 1
+				}
+				`+` {
+					// println("q: ${char_tmp:c}")
+					re.prog[pc - 1].rep_min = 1
+					re.prog[pc - 1].rep_max = regex.max_quantifier
+				}
+				`*` {
+					// println("q: ${char_tmp:c}")
+					re.prog[pc - 1].rep_min = 0
+					re.prog[pc - 1].rep_max = regex.max_quantifier
+				}
+				`{` {
+					min, max, tmp, greedy := re.parse_quantifier(in_txt, i + 1)
+					// it is a quantifier
+					if min >= 0 {
+						// println("{$min,$max}\n str:[${in_txt[i..i+tmp]}] greedy:$greedy")
+						i = i + tmp
+						re.prog[pc - 1].rep_min = min
+						re.prog[pc - 1].rep_max = max
+						re.prog[pc - 1].greedy = greedy
+						continue
+					} else {
+						return min, i
+					}
+					// TODO: decide if the open bracket can be conform without the close bracket
+					/*
+					// no conform, parse as normal char
+					else {
+						quant_flag = false
+					}
+					*/
+				}
+				else {
+					quant_flag = false
+				}
+			}
+
+			if quant_flag {
+				i = i + char_len
+				continue
+			}
+		}
+
+		// IST_CHAR_CLASS_*
+		if char_len == 1 && pc >= 0 {
+			if byte(char_tmp) == `[` {
+				cc_index, tmp, cc_type := re.parse_char_class(in_txt, i + 1)
+				if cc_index >= 0 {
+					// println("index: $cc_index str:${in_txt[i..i+tmp]}")
+					i = i + tmp
+					re.prog[pc].ist = u32(0) | cc_type
+					re.prog[pc].cc_index = cc_index
+					re.prog[pc].rep_min = 1
+					re.prog[pc].rep_max = 1
+					pc = pc + 1
+					continue
+				}
+				// cc_class vector memory full
+				else if cc_index < 0 {
+					return cc_index, i
+				}
+			}
+		}
+
+		// ist_bsls_char
+		if char_len == 1 && pc >= 0 {
+			if byte(char_tmp) == `\\` {
+				bsls_index, tmp := re.parse_bsls(in_txt, i)
+				// println("index: $bsls_index str:${in_txt[i..i+tmp]}")
+				if bsls_index >= 0 {
+					i = i + tmp
+					re.prog[pc].ist = u32(0) | regex.ist_bsls_char
+					re.prog[pc].rep_min = 1
+					re.prog[pc].rep_max = 1
+					re.prog[pc].validator = regex.bsls_validator_array[bsls_index].validator
+					re.prog[pc].ch = regex.bsls_validator_array[bsls_index].ch
+					pc = pc + 1
+					continue
+				}
+				// this is an escape char, skip the bsls and continue as a normal char
+				else if bsls_index == regex.no_match_found {
+					i += char_len
+					char_tmp, char_len = re.get_char(in_txt, i)
+					// continue as simple char
+				}
+				// if not an escape or a bsls char then it is an error (at least for now!)
+				else {
+					return bsls_index, i + tmp
+				}
+			}
+		}
+
+		// ist_simple_char
+		re.prog[pc].ist = regex.ist_simple_char
+		re.prog[pc].ch = char_tmp
+		re.prog[pc].ch_len = byte(char_len)
+		re.prog[pc].rep_min = 1
+		re.prog[pc].rep_max = 1
+		// println("char: ${char_tmp:c}")
+		pc = pc + 1
+
+		i += char_len
+	}
+
+	// add end of the program
+	re.prog[pc].ist = regex.ist_prog_end
+	re.prog_len = pc
+
+	// check for unbalanced groups
+	if group_stack_index != -1 {
+		return regex.err_group_not_balanced, group_stack_txt_index[group_stack_index] + 1
+	}
+
+	// check for OR at the end of the program
+	if pc > 0 && re.prog[pc - 1].ist == regex.ist_or_branch {
+		return regex.err_syntax_error, in_txt.len
+	}
+
+	// store the number of groups in the query
+	re.group_count = group_count + 1
+
+	//******************************************
+	// Post processing
+	//******************************************
+
+	//
+	// manage ist_dot_char
+	//
+
+	// find the checks for dot chars, if any...
+	mut pc1 := 0
+	mut dot_char_count := 0
+	mut last_dot_char_pc := -1
+	for pc1 < pc {
+		if re.prog[pc1].ist == regex.ist_dot_char {
+			// println("Dot_char pc: $pc1")
+			last_dot_char_pc = pc1
+			dot_char_count++
+			mut pc2 := pc1 + 1
+			for pc2 < pc {
+				if re.prog[pc2].ist == regex.ist_dot_char {
+					return regex.err_syntax_error, 0
+				}
+				if re.prog[pc2].ist !in [rune(regex.ist_prog_end), regex.ist_group_end,
+					regex.ist_group_start,
+				] {
+					// println("Next dot char check is PC: ${pc2}")
+					re.prog[pc1].dot_check_pc = pc2
+					break
+				}
+				pc2++
+			}
+		}
+		pc1++
+	}
+
+	// println("last_dot_char_pc: $last_dot_char_pc")
+	if last_dot_char_pc >= 0 {
+		pc1 = last_dot_char_pc + 1
+		mut is_last_dot := true
+		for pc1 < pc {
+			if re.prog[pc1].ist !in [rune(regex.ist_prog_end), regex.ist_group_end] {
+				is_last_dot = false
+				break
+			}
+			pc1++
+		}
+		if is_last_dot {
+			re.prog[last_dot_char_pc].last_dot_flag = true
+		}
+	}
+
+	//******************************************
+
+	// OR branch
+	// a|b|cd
+	// d exit point
+	// a,b,c branches
+	// set the jump in the right places
+	pc1 = 0
+	for pc1 < pc - 2 {
+		// println("Here $pc1 ${pc-2}")
+		// two consecutive OR are a syntax error
+		if re.prog[pc1 + 1].ist == regex.ist_or_branch
+			&& re.prog[pc1 + 2].ist == regex.ist_or_branch {
+			return regex.err_syntax_error, i
+		}
+
+		// manange a|b chains like a|(b)|c|d...
+		// standard solution
+		if re.prog[pc1].ist != regex.ist_or_branch && re.prog[pc1 + 1].ist == regex.ist_or_branch
+			&& re.prog[pc1 + 2].ist != regex.ist_or_branch {
+			re.prog[pc1].next_is_or = true // set that the next token is an  OR
+			re.prog[pc1 + 1].rep_min = pc1 + 2 // failed match jump
+
+			// match jump, if an OR chain the next token will be an OR token
+			mut pc2 := pc1 + 2
+			for pc2 < pc - 1 {
+				ist := re.prog[pc2].ist
+				if ist == regex.ist_group_start {
+					re.prog[pc1 + 1].rep_max = re.prog[pc2].goto_pc + 1
+					break
+				}
+				if ist != regex.ist_or_branch {
+					re.prog[pc1 + 1].rep_max = pc2 + 1
+					break
+				}
+
+				pc2++
+			}
+			// special case query of few chars, teh true can't go on the first instruction
+			if re.prog[pc1 + 1].rep_max == pc1 {
+				re.prog[pc1 + 1].rep_max = 3
+			}
+			// println("Compile OR postproc. [$pc1,OR ${pc1+1},$pc2]")
+			pc1 = pc2
+			continue
+		}
+
+		pc1++
+	}
+
+	//******************************************
+	// DEBUG PRINT REGEX GENERATED CODE
+	//******************************************
+	if re.debug > 0 {
+		gc := re.get_code()
+		re.log_func(gc)
+	}
+	//******************************************
+
+	return regex.compile_ok, 0
+}
+
+// get_code return the compiled code as regex string, note: may be different from the source!
+pub fn (re RE) get_code() string {
+	mut pc1 := 0
+	mut res := strings.new_builder(re.cc.len * 2 * re.prog.len)
+	res.write_string('========================================\nv RegEx compiler v $regex.v_regex_version output:\n')
+
+	mut stop_flag := false
+
+	for pc1 <= re.prog.len {
+		tk := re.prog[pc1]
+		res.write_string('PC:${pc1:3d}')
+
+		res.write_string(' ist: ')
+		res.write_string('${tk.ist:8x}'.replace(' ', '0'))
+		res.write_string(' ')
+		ist := tk.ist
+		if ist == regex.ist_bsls_char {
+			res.write_string('[\\${tk.ch:1c}]     BSLS')
+		} else if ist == regex.ist_prog_end {
+			res.write_string('PROG_END')
+			stop_flag = true
+		} else if ist == regex.ist_or_branch {
+			res.write_string('OR      ')
+		} else if ist == regex.ist_char_class_pos {
+			res.write_string('[${re.get_char_class(pc1)}]     CHAR_CLASS_POS')
+		} else if ist == regex.ist_char_class_neg {
+			res.write_string('[^${re.get_char_class(pc1)}]    CHAR_CLASS_NEG')
+		} else if ist == regex.ist_dot_char {
+			res.write_string('.        DOT_CHAR nx chk: $tk.dot_check_pc')
+			if tk.last_dot_flag == true {
+				res.write_string(' last!')
+			}
+		} else if ist == regex.ist_group_start {
+			res.write_string('(        GROUP_START #:$tk.group_id')
+			if tk.group_id == -1 {
+				res.write_string(' ?:')
+			} else {
+				for x in re.group_map.keys() {
+					if re.group_map[x] == (tk.group_id + 1) {
+						res.write_string(' ?P<$x>')
+						break
+					}
+				}
+			}
+		} else if ist == regex.ist_group_end {
+			res.write_string(')        GROUP_END   #:$tk.group_id')
+		} else if ist == regex.ist_simple_char {
+			res.write_string('[${tk.ch:1c}]      query_ch')
+		}
+
+		if tk.rep_max == regex.max_quantifier {
+			res.write_string(' {${tk.rep_min:3d},MAX}')
+		} else {
+			if ist == regex.ist_or_branch {
+				res.write_string(' if false go: ${tk.rep_min:3d} if true go: ${tk.rep_max:3d}')
+			} else {
+				res.write_string(' {${tk.rep_min:3d},${tk.rep_max:3d}}')
+			}
+			if tk.greedy == true {
+				res.write_string('?')
+			}
+		}
+
+		res.write_string('\n')
+		if stop_flag {
+			break
+		}
+		pc1++
+	}
+
+	res.write_string('========================================\n')
+	return res.str()
+}
+
+// get_query return a string with a reconstruction of the query starting from the regex program code
+pub fn (re RE) get_query() string {
+	mut res := strings.new_builder(re.query.len * 2)
+
+	if (re.flag & regex.f_ms) != 0 {
+		res.write_string('^')
+	}
+
+	mut i := 0
+	for i < re.prog.len && re.prog[i].ist != regex.ist_prog_end && re.prog[i].ist != 0 {
+		tk := unsafe { &re.prog[i] }
+		ch := tk.ist
+
+		// GROUP start
+		if ch == regex.ist_group_start {
+			if re.debug == 0 {
+				res.write_string('(')
+			} else {
+				if tk.group_id == -1 {
+					res.write_string('(?:') // non capturing group
+				} else {
+					res.write_string('#${tk.group_id}(')
+				}
+			}
+
+			for x in re.group_map.keys() {
+				if re.group_map[x] == (tk.group_id + 1) {
+					res.write_string('?P<$x>')
+					break
+				}
+			}
+
+			i++
+			continue
+		}
+
+		// GROUP end
+		if ch == regex.ist_group_end {
+			res.write_string(')')
+		}
+
+		// OR branch
+		if ch == regex.ist_or_branch {
+			res.write_string('|')
+			if re.debug > 0 {
+				res.write_string('{$tk.rep_min,$tk.rep_max}')
+			}
+			i++
+			continue
+		}
+
+		// char class
+		if ch == regex.ist_char_class_neg || ch == regex.ist_char_class_pos {
+			res.write_string('[')
+			if ch == regex.ist_char_class_neg {
+				res.write_string('^')
+			}
+			res.write_string('${re.get_char_class(i)}')
+			res.write_string(']')
+		}
+
+		// bsls char
+		if ch == regex.ist_bsls_char {
+			res.write_string('\\${tk.ch:1c}')
+		}
+
+		// ist_dot_char
+		if ch == regex.ist_dot_char {
+			res.write_string('.')
+		}
+
+		// char alone
+		if ch == regex.ist_simple_char {
+			if byte(ch) in regex.bsls_escape_list {
+				res.write_string('\\')
+			}
+			res.write_string('${tk.ch:c}')
+		}
+
+		// quantifier
+		if !(tk.rep_min == 1 && tk.rep_max == 1) {
+			if tk.rep_min == 0 && tk.rep_max == 1 {
+				res.write_string('?')
+			} else if tk.rep_min == 1 && tk.rep_max == regex.max_quantifier {
+				res.write_string('+')
+			} else if tk.rep_min == 0 && tk.rep_max == regex.max_quantifier {
+				res.write_string('*')
+			} else {
+				if tk.rep_max == regex.max_quantifier {
+					res.write_string('{$tk.rep_min,MAX}')
+				} else {
+					res.write_string('{$tk.rep_min,$tk.rep_max}')
+				}
+				if tk.greedy == true {
+					res.write_string('?')
+				}
+			}
+		}
+		i++
+	}
+	if (re.flag & regex.f_me) != 0 {
+		res.write_string('$')
+	}
+
+	return res.str()
+}
+
+/******************************************************************************
+*
+* Groups saving utilities
+*
+******************************************************************************/
+[direct_array_access]
+fn (mut re RE) group_continuous_save(g_index int) {
+	if re.group_csave_flag == true {
+		// continuous save, save until we have space
+
+		// init the first element as counter
+		if re.group_csave.len == 0 {
+			re.group_csave << 0
+		}
+
+		gi := g_index >> 1
+		start := re.groups[g_index]
+		end := re.groups[g_index + 1]
+
+		// check if we are simply increasing the size ot the found group
+		if re.group_csave.len >= 4 && gi == re.group_csave[re.group_csave.len - 3]
+			&& start == re.group_csave[re.group_csave.len - 2] {
+			re.group_csave[re.group_csave.len - 1] = end
+			return
+		}
+
+		// otherwise append a new group to the list
+
+		// increment counter
+		re.group_csave[0]++
+		// save the record
+		re.group_csave << (g_index >> 1) // group id
+		re.group_csave << re.groups[g_index] // start
+		re.group_csave << re.groups[g_index + 1] // end
+	}
+}
+
+/******************************************************************************
+*
+* Matching
+*
+******************************************************************************/
+enum Match_state {
+	start = 0
+	stop
+	end
+	new_line
+	ist_load // load and execute instruction
+	ist_next // go to next instruction
+	ist_next_ks // go to next instruction without clenaning the state
+	ist_quant_p // match positive ,quantifier check
+	ist_quant_n // match negative, quantifier check
+	ist_quant_pg // match positive ,group quantifier check
+	ist_quant_ng // match negative ,group quantifier check
+}
+
+fn state_str(s Match_state) string {
+	match s {
+		.start { return 'start' }
+		.stop { return 'stop' }
+		.end { return 'end' }
+		.new_line { return 'new line' }
+		.ist_load { return 'ist_load' }
+		.ist_next { return 'ist_next' }
+		.ist_next_ks { return 'ist_next_ks' }
+		.ist_quant_p { return 'ist_quant_p' }
+		.ist_quant_n { return 'ist_quant_n' }
+		.ist_quant_pg { return 'ist_quant_pg' }
+		.ist_quant_ng { return 'ist_quant_ng' }
+	}
+}
+
+struct StateObj {
+pub mut:
+	group_index int = -1 // group id used to know how many groups are open
+	match_flag  bool // indicate if we are in a match condition
+	match_index int = -1 // index of the last match
+	first_match int = -1 // index of the first match
+	pc          int = -1 // program counter
+	i           int = -1 // source string index
+	char_len    int  // last char legth
+	last_dot_pc int = -1 // last dot chat pc
+}
+
+[direct_array_access]
+pub fn (mut re RE) match_base(in_txt &byte, in_txt_len int) (int, int) {
+	// result status
+	mut result := regex.no_match_found // function return
+
+	mut ch := rune(0) // examinated char
+	mut char_len := 0 // utf8 examinated char len
+	mut m_state := Match_state.start // start point for the matcher FSM
+	mut src_end := false
+	mut last_fnd_pc := -1
+
+	mut state := StateObj{} // actual state
+	mut ist := rune(0) // actual instruction
+	mut l_ist := rune(0) // last matched instruction
+
+	mut step_count := 0 // stats for debug
+	mut dbg_line := 0 // count debug line printed
+
+	re.reset()
+
+	if re.debug > 0 {
+		// print header
+		mut h_buf := strings.new_builder(32)
+		h_buf.write_string('flags: ')
+		h_buf.write_string('${re.flag:8x}'.replace(' ', '0'))
+		h_buf.write_string('\n')
+		sss := h_buf.str()
+		re.log_func(sss)
+	}
+
+	for m_state != .end {
+		if state.pc >= 0 && state.pc < re.prog.len {
+			ist = re.prog[state.pc].ist
+		} else if state.pc >= re.prog.len {
+			// println("ERROR!! PC overflow!!")
+			return regex.err_internal_error, state.i
+		}
+
+		//******************************************
+		// DEBUG LOG
+		//******************************************
+		if re.debug > 0 {
+			mut buf2 := strings.new_builder(re.cc.len + 128)
+
+			// print all the instructions
+
+			// end of the input text
+			if state.i >= in_txt_len {
+				buf2.write_string('# ${step_count:3d} END OF INPUT TEXT\n')
+				sss := buf2.str()
+				re.log_func(sss)
+			} else {
+				// print only the exe instruction
+				if (re.debug == 1 && m_state == .ist_load) || re.debug == 2 {
+					if ist == regex.ist_prog_end {
+						buf2.write_string('# ${step_count:3d} PROG_END\n')
+					} else if ist == 0 || m_state in [.start, .ist_next, .stop] {
+						buf2.write_string('# ${step_count:3d} s: ${state_str(m_state):12s} PC: NA\n')
+					} else {
+						ch, char_len = re.get_charb(in_txt, state.i)
+
+						buf2.write_string('# ${step_count:3d} s: ${state_str(m_state):12s} PC: ${state.pc:3d}=>')
+						buf2.write_string('${ist:8x}'.replace(' ', '0'))
+						buf2.write_string(" i,ch,len:[${state.i:3d},'${utf8_str(ch)}',$char_len] f.m:[${state.first_match:3d},${state.match_index:3d}] ")
+
+						if ist == regex.ist_simple_char {
+							buf2.write_string('query_ch: [${re.prog[state.pc].ch:1c}]')
+						} else {
+							if ist == regex.ist_bsls_char {
+								buf2.write_string('BSLS [\\${re.prog[state.pc].ch:1c}]')
+							} else if ist == regex.ist_prog_end {
+								buf2.write_string('PROG_END')
+							} else if ist == regex.ist_or_branch {
+								buf2.write_string('OR')
+							} else if ist == regex.ist_char_class_pos {
+								buf2.write_string('CHAR_CLASS_POS[${re.get_char_class(state.pc)}]')
+							} else if ist == regex.ist_char_class_neg {
+								buf2.write_string('CHAR_CLASS_NEG[${re.get_char_class(state.pc)}]')
+							} else if ist == regex.ist_dot_char {
+								buf2.write_string('DOT_CHAR')
+							} else if ist == regex.ist_group_start {
+								tmp_gi := re.prog[state.pc].group_id
+								tmp_gr := re.prog[re.prog[state.pc].goto_pc].group_rep
+								buf2.write_string('GROUP_START #:$tmp_gi rep:$tmp_gr ')
+							} else if ist == regex.ist_group_end {
+								buf2.write_string('GROUP_END   #:${re.prog[state.pc].group_id} deep:$state.group_index')
+							}
+						}
+						if re.prog[state.pc].rep_max == regex.max_quantifier {
+							buf2.write_string('{${re.prog[state.pc].rep_min},MAX}:${re.prog[state.pc].rep}')
+						} else {
+							buf2.write_string('{${re.prog[state.pc].rep_min},${re.prog[state.pc].rep_max}}:${re.prog[state.pc].rep}')
+						}
+						if re.prog[state.pc].greedy == true {
+							buf2.write_string('?')
+						}
+						buf2.write_string(' (#$state.group_index)')
+
+						if ist == regex.ist_dot_char {
+							buf2.write_string(' last!')
+						}
+
+						buf2.write_string('\n')
+					}
+					sss2 := buf2.str()
+					re.log_func(sss2)
+				}
+			}
+			step_count++
+			dbg_line++
+		}
+		//******************************************
+
+		if ist == regex.ist_prog_end {
+			// println("HERE we end!")
+			break
+		}
+
+		// we're out of text, manage it
+		if state.i >= in_txt_len || m_state == .new_line {
+			// println("Finished text!!")
+			src_end = true
+
+			// manage groups
+			if state.group_index >= 0 && state.match_index >= 0 {
+				// println("End text with open groups!")
+				// close the groups
+				for state.group_index >= 0 {
+					tmp_pc := re.group_data[state.group_index]
+					re.prog[tmp_pc].group_rep++
+					// println("Closing group $state.group_index {${re.prog[tmp_pc].rep_min},${re.prog[tmp_pc].rep_max}}:${re.prog[tmp_pc].group_rep}")
+
+					if re.prog[tmp_pc].group_rep >= re.prog[tmp_pc].rep_min
+						&& re.prog[tmp_pc].group_id >= 0 {
+						start_i := re.group_stack[state.group_index]
+						re.group_stack[state.group_index] = -1
+
+						// save group results
+						g_index := re.prog[tmp_pc].group_id * 2
+						if start_i >= 0 {
+							re.groups[g_index] = start_i
+						} else {
+							re.groups[g_index] = 0
+						}
+						// we have fished the text, we must manage out pf bound indexes
+						if state.i >= in_txt_len {
+							state.i = in_txt_len - 1
+						}
+						re.groups[g_index + 1] = state.i
+
+						if re.groups[g_index + 1] >= in_txt_len {
+							// println("clamp group on stop!")
+							re.groups[g_index + 1] = in_txt_len - 1
+						}
+
+						// continuous save, save until we have space
+						re.group_continuous_save(g_index)
+					}
+					state.group_index--
+				}
+			}
+
+			// the text is finished and the groups closed and we are the last group, ok exit
+			if ist == regex.ist_group_end && re.prog[state.pc + 1].ist == regex.ist_prog_end {
+				// println("Last group end")
+				return state.first_match, state.i
+			}
+
+			if state.pc == -1 {
+				state.pc = last_fnd_pc
+			}
+
+			// println("Finished text!!")
+			// println("Instruction: ${ist:08x} pc: $state.pc")
+			// println("min_rep: ${re.prog[state.pc].rep_min} max_rep: ${re.prog[state.pc].rep_max} rep: ${re.prog[state.pc].rep}")
+
+			// program end
+			if ist == regex.ist_prog_end {
+				// println("Program end on end of text!")
+				return state.first_match, state.i
+			}
+
+			// we are in a last dot_ char case
+			if l_ist == regex.ist_dot_char {
+				// println("***** We have a last dot_char")
+				// println("PC: ${state.pc} last_dot_flag:${re.prog[state.pc].last_dot_flag}")
+				// println("rep: ${re.prog[state.pc].group_rep} min: ${re.prog[state.pc].rep_min} max: ${re.prog[state.pc].rep_max}")
+				// println("first match: ${state.first_match}")
+				if re.prog[state.pc].last_dot_flag == true
+					&& re.prog[state.pc].rep >= re.prog[state.pc].rep_min
+					&& re.prog[state.pc].rep <= re.prog[state.pc].rep_max {
+					return state.first_match, state.i
+				}
+				// println("Not fitted!!")
+			}
+
+			// m_state = .end
+			// break
+			return regex.no_match_found, 0
+		}
+
+		// starting and init
+		if m_state == .start {
+			state.pc = -1
+			state.i = 0
+			m_state = .ist_next
+			continue
+		}
+		// ist_next, next instruction reseting its state
+		else if m_state == .ist_next {
+			state.pc = state.pc + 1
+			re.prog[state.pc].reset()
+			// check if we are in the program bounds
+			if state.pc < 0 || state.pc > re.prog.len {
+				// println("ERROR!! PC overflow!!")
+				return regex.err_internal_error, state.i
+			}
+			m_state = .ist_load
+			continue
+		}
+		// ist_next_ks, next instruction keeping its state
+		else if m_state == .ist_next_ks {
+			state.pc = state.pc + 1
+			// check if we are in the program bounds
+			if state.pc < 0 || state.pc > re.prog.len {
+				// println("ERROR!! PC overflow!!")
+				return regex.err_internal_error, state.i
+			}
+			m_state = .ist_load
+			continue
+		}
+
+		// load the char
+		ch, char_len = re.get_charb(in_txt, state.i)
+
+		// check new line if flag f_nl enabled
+		if (re.flag & regex.f_nl) != 0 && char_len == 1 && byte(ch) in regex.new_line_list {
+			m_state = .new_line
+			continue
+		}
+		// check if stop
+		else if m_state == .stop {
+			// we are in search mode, don't exit until the end
+			if ((re.flag & regex.f_src) != 0) && (ist != regex.ist_prog_end) {
+				last_fnd_pc = state.pc
+				state.pc = -1
+				state.i += char_len
+
+				m_state = .ist_next
+				re.reset_src()
+				state.match_index = -1
+				state.first_match = -1
+
+				// reset state list
+				re.reset()
+
+				continue
+			}
+
+			if ist == regex.ist_prog_end {
+				return state.first_match, state.i
+			}
+
+			// manage here dot char
+
+			if re.state_list.len > 0 {
+				// println("Here we are, with stop: state buffer: [${re.state_list.len}]")
+				state = re.state_list.pop()
+
+				state.match_flag = true
+				l_ist = u32(regex.ist_dot_char)
+
+				if state.first_match < 0 {
+					state.first_match = state.i
+				}
+				state.match_index = state.i
+				re.prog[state.pc].rep++ // increase repetitions
+
+				state.i += char_len
+				m_state = .ist_quant_p
+				continue
+			}
+
+			// exit on no match
+			return result, 0
+		}
+		// ist_load
+		else if m_state == .ist_load {
+			// program end
+			if ist == regex.ist_prog_end {
+				// if we are in match exit well
+
+				if state.group_index >= 0 && state.match_index >= 0 {
+					state.group_index = -1
+				}
+
+				m_state = .stop
+				continue
+			}
+			// check GROUP start, no quantifier is checkd for this token!!
+			else if ist == regex.ist_group_start {
+				state.group_index++
+				re.group_data[state.group_index] = re.prog[state.pc].goto_pc // save where is ist_group_end, we will use it for escape
+				re.group_stack[state.group_index] = state.i // index where we start to manage
+				// println("group_index $state.group_index rep ${re.prog[re.prog[state.pc].goto_pc].group_rep}")
+
+				m_state = .ist_next
+				continue
+			}
+			// check GROUP end
+			else if ist == regex.ist_group_end {
+				// we are in matching streak
+				// println("Group END!! last ist: ${l_ist:08x}")
+				if state.match_index >= 0 {
+					// restore txt index stack and save the group data
+
+					// println("g.id: ${re.prog[state.pc].group_id} group_index: ${state.group_index}")
+					if state.group_index >= 0 && re.prog[state.pc].group_id >= 0 {
+						start_i := re.group_stack[state.group_index]
+
+						// save group results
+						g_index := re.prog[state.pc].group_id * 2
+
+						if start_i >= 0 {
+							re.groups[g_index] = start_i
+						} else {
+							re.groups[g_index] = 0
+						}
+
+						re.groups[g_index + 1] = state.i
+
+						if g_index > 0 && re.groups[g_index] <= re.groups[g_index - 1] {
+							re.groups[g_index] = re.groups[g_index - 1]
+						}
+
+						if re.groups[g_index + 1] >= in_txt_len {
+							// println("clamp group!")
+							re.groups[g_index + 1] = in_txt_len - 1
+						}
+
+						// println("GROUP ${re.prog[state.pc].group_id} END [${re.groups[g_index]}, ${re.groups[g_index+1]}] i: $state.i in_txt_len: $in_txt_len")
+
+						// continuous save, save until we have space
+						re.group_continuous_save(g_index)
+					}
+
+					re.prog[state.pc].group_rep++ // increase repetitions
+					// println("GROUP $group_index END ${re.prog[state.pc].group_rep}")
+					m_state = .ist_quant_pg
+					continue
+				}
+
+				m_state = .ist_quant_ng
+				continue
+			}
+			// check OR
+			else if ist == regex.ist_or_branch {
+				if state.match_index >= 0 {
+					state.pc = re.prog[state.pc].rep_max
+					// println("ist_or_branch True pc: $state.pc")
+				} else {
+					state.pc = re.prog[state.pc].rep_min
+					// println("ist_or_branch False pc: $state.pc")
+				}
+				re.prog[state.pc].reset()
+				m_state = .ist_load
+				continue
+			}
+			// check ist_dot_char
+			else if ist == regex.ist_dot_char {
+				// println("ist_dot_char rep: ${re.prog[state.pc].rep}")
+
+				// check next token to be false
+				mut next_check_flag := false
+
+				// if we are done with max go on dot char are dedicated case!!
+				if re.prog[state.pc].rep >= re.prog[state.pc].rep_max {
+					re.state_list.pop()
+					m_state = .ist_next
+					continue
+				}
+
+				if re.prog[state.pc].dot_check_pc >= 0
+					&& re.prog[state.pc].rep >= re.prog[state.pc].rep_min {
+					// load the char
+					// ch_t, _ := re.get_charb(in_txt, state.i+char_len)
+					ch_t := ch
+					chk_pc := re.prog[state.pc].dot_check_pc
+
+					// simple char
+					if re.prog[chk_pc].ist == regex.ist_simple_char {
+						if re.prog[chk_pc].ch == ch_t {
+							next_check_flag = true
+						}
+						// println("Check [ist_simple_char] [${re.prog[chk_pc].ch}]==[${ch_t:c}] => $next_check_flag")
+					}
+					// char char_class
+					else if re.prog[chk_pc].ist == regex.ist_char_class_pos
+						|| re.prog[chk_pc].ist == regex.ist_char_class_neg {
+						mut cc_neg := false
+						if re.prog[chk_pc].ist == regex.ist_char_class_neg {
+							cc_neg = true
+						}
+						mut cc_res := re.check_char_class(chk_pc, ch_t)
+
+						if cc_neg {
+							cc_res = !cc_res
+						}
+						next_check_flag = cc_res
+						// println("Check [ist_char_class] => $next_check_flag")
+					}
+					// check bsls
+					else if re.prog[chk_pc].ist == regex.ist_bsls_char {
+						next_check_flag = re.prog[chk_pc].validator(byte(ch_t))
+						// println("Check [ist_bsls_char] => $next_check_flag")
+					}
+				}
+
+				// check if we must continue or pass to the next IST
+				if next_check_flag == true && re.prog[state.pc + 1].ist != regex.ist_prog_end {
+					// println("save the state!!")
+					mut dot_state := StateObj{
+						group_index: state.group_index
+						match_flag: state.match_flag
+						match_index: state.match_index
+						first_match: state.first_match
+						pc: state.pc
+						i: state.i + char_len
+						char_len: char_len
+						last_dot_pc: state.pc
+					}
+					// if we are mananging a .* stay on the same char on return
+					if re.prog[state.pc].rep_min == 0 {
+						dot_state.i -= char_len
+					}
+
+					re.state_list << dot_state
+
+					m_state = .ist_quant_n
+					// println("dot_char stack len: ${re.state_list.len}")
+					continue
+				}
+
+				state.match_flag = true
+				l_ist = u32(regex.ist_dot_char)
+
+				if state.first_match < 0 {
+					state.first_match = state.i
+				}
+				state.match_index = state.i
+				re.prog[state.pc].rep++ // increase repetitions
+
+				state.i += char_len
+				m_state = .ist_quant_p
+				continue
+			}
+			// char class IST
+			else if ist == regex.ist_char_class_pos || ist == regex.ist_char_class_neg {
+				state.match_flag = false
+				mut cc_neg := false
+
+				if ist == regex.ist_char_class_neg {
+					cc_neg = true
+				}
+				mut cc_res := re.check_char_class(state.pc, ch)
+
+				if cc_neg {
+					cc_res = !cc_res
+				}
+
+				if cc_res {
+					state.match_flag = true
+					l_ist = u32(regex.ist_char_class_pos)
+
+					if state.first_match < 0 {
+						state.first_match = state.i
+					}
+
+					state.match_index = state.i
+
+					re.prog[state.pc].rep++ // increase repetitions
+					state.i += char_len // next char
+					m_state = .ist_quant_p
+					continue
+				}
+				m_state = .ist_quant_n
+				continue
+			}
+			// check bsls
+			else if ist == regex.ist_bsls_char {
+				state.match_flag = false
+				tmp_res := re.prog[state.pc].validator(byte(ch))
+				// println("BSLS in_ch: ${ch:c} res: $tmp_res")
+				if tmp_res {
+					state.match_flag = true
+					l_ist = u32(regex.ist_bsls_char)
+
+					if state.first_match < 0 {
+						state.first_match = state.i
+					}
+
+					state.match_index = state.i
+
+					re.prog[state.pc].rep++ // increase repetitions
+					state.i += char_len // next char
+					m_state = .ist_quant_p
+					continue
+				}
+				m_state = .ist_quant_n
+				continue
+			}
+			// simple char IST
+			else if ist == regex.ist_simple_char {
+				// println("ist_simple_char")
+				state.match_flag = false
+
+				if re.prog[state.pc].ch == ch {
+					state.match_flag = true
+					l_ist = regex.ist_simple_char
+
+					if state.first_match < 0 {
+						state.first_match = state.i
+					}
+					// println("state.match_index: ${state.match_index}")
+					state.match_index = state.i
+
+					re.prog[state.pc].rep++ // increase repetitions
+					state.i += char_len // next char
+					m_state = .ist_quant_p
+					continue
+				}
+				m_state = .ist_quant_n
+				continue
+			}
+			// UNREACHABLE
+			// println("PANIC2!! state: $m_state")
+			return regex.err_internal_error, state.i
+		}
+		/***********************************
+		* Quantifier management
+		***********************************/
+		// ist_quant_ng => quantifier negative test on group
+		else if m_state == .ist_quant_ng {
+			// we are finished here
+			if state.group_index < 0 {
+				// println("Early stop!")
+				result = regex.no_match_found
+				m_state = .stop
+				continue
+			}
+
+			tmp_pc := re.group_data[state.group_index] // PC to the end of the group token
+			rep := re.prog[tmp_pc].group_rep // use a temp variable
+			re.prog[tmp_pc].group_rep = 0 // clear the repetitions
+
+			// println(".ist_quant_ng group_pc_end: $tmp_pc rep: $rep")
+
+			if rep >= re.prog[tmp_pc].rep_min {
+				// println("ist_quant_ng GROUP CLOSED OK group_index: $state.group_index")
+
+				state.i = re.group_stack[state.group_index]
+				state.pc = tmp_pc
+				state.group_index--
+				m_state = .ist_next
+				continue
+			} else if re.prog[tmp_pc].next_is_or {
+				// println("ist_quant_ng OR Negative branch")
+
+				state.i = re.group_stack[state.group_index]
+				state.pc = re.prog[tmp_pc + 1].rep_min - 1
+				state.group_index--
+				m_state = .ist_next
+				continue
+			} else if rep > 0 && rep < re.prog[tmp_pc].rep_min {
+				// println("ist_quant_ng UNDER THE MINIMUM g.i: $state.group_index")
+
+				// check if we are inside a group, if yes exit from the nested groups
+				if state.group_index > 0 {
+					state.group_index--
+					state.pc = tmp_pc
+					m_state = .ist_quant_ng //.ist_next
+					continue
+				}
+
+				if state.group_index == 0 {
+					state.group_index--
+					state.pc = tmp_pc // TEST
+					m_state = .ist_next
+					continue
+				}
+
+				result = regex.no_match_found
+				m_state = .stop
+				continue
+			} else if rep == 0 && rep < re.prog[tmp_pc].rep_min {
+				// println("ist_quant_ng c_zero UNDER THE MINIMUM g.i: $state.group_index")
+
+				if state.group_index > 0 {
+					state.group_index--
+					state.pc = tmp_pc
+					m_state = .ist_quant_ng //.ist_next
+					continue
+				}
+
+				result = regex.no_match_found
+				m_state = .stop
+				continue
+			}
+
+			// println("DO NOT STAY HERE!! {${re.prog[tmp_pc].rep_min},${re.prog[tmp_pc].rep_max}}:$rep")
+			// UNREACHABLE
+			return regex.err_internal_error, state.i
+		}
+		// ist_quant_pg => quantifier positive test on group
+		else if m_state == .ist_quant_pg {
+			// println(".ist_quant_pg")
+			mut tmp_pc := state.pc
+			if state.group_index >= 0 {
+				tmp_pc = re.group_data[state.group_index]
+			}
+
+			rep := re.prog[tmp_pc].group_rep
+
+			if rep < re.prog[tmp_pc].rep_min {
+				// println("ist_quant_pg UNDER RANGE")
+				state.pc = re.prog[tmp_pc].goto_pc
+				m_state = .ist_next
+				continue
+			} else if rep == re.prog[tmp_pc].rep_max {
+				// println("ist_quant_pg MAX RANGE")
+				re.prog[tmp_pc].group_rep = 0 // clear the repetitions
+				state.group_index--
+				m_state = .ist_next
+
+				continue
+			} else if rep >= re.prog[tmp_pc].rep_min {
+				// println("ist_quant_pg IN RANGE group_index:$state.group_index")
+
+				// check greedy flag, if true exit on minimum
+				if re.prog[tmp_pc].greedy == true {
+					re.prog[tmp_pc].group_rep = 0 // clear the repetitions
+					state.group_index--
+					m_state = .ist_next
+					continue
+				}
+
+				state.pc = re.prog[tmp_pc].goto_pc - 1
+				state.group_index--
+				m_state = .ist_next
+				continue
+			}
+
+			// UNREACHABLE
+			// println("PANIC3!! state: $m_state")
+			return regex.err_internal_error, state.i
+		}
+		// ist_quant_n => quantifier negative test on token
+		else if m_state == .ist_quant_n {
+			rep := re.prog[state.pc].rep
+			// println("Here!! PC $state.pc is_next_or: ${re.prog[state.pc].next_is_or}")
+
+			// zero quantifier * or ?
+			if rep == 0 && re.prog[state.pc].rep_min == 0 {
+				// println("ist_quant_n c_zero RANGE MIN")
+				m_state = .ist_next // go to next ist
+				continue
+			}
+			// match + or *
+			else if rep >= re.prog[state.pc].rep_min {
+				// println("ist_quant_n MATCH RANGE")
+				m_state = .ist_next
+				continue
+			}
+
+			// check the OR if present
+			if re.prog[state.pc].next_is_or {
+				// println("OR present on failing")
+				state.match_index = -1
+				m_state = .ist_next
+				continue
+			}
+
+			// we are in a group manage no match from here
+			if state.group_index >= 0 {
+				// println("ist_quant_n FAILED insied a GROUP group_index:$state.group_index")
+				m_state = .ist_quant_ng
+				continue
+			}
+
+			// no other options
+			// println("ist_quant_n no_match_found")
+			result = regex.no_match_found
+			m_state = .stop
+			continue
+			// return no_match_found, 0
+		}
+		// ist_quant_p => quantifier positive test on token
+		else if m_state == .ist_quant_p {
+			// exit on first match
+			if (re.flag & regex.f_efm) != 0 {
+				return state.i, state.i + 1
+			}
+
+			rep := re.prog[state.pc].rep
+
+			// under range
+			if rep > 0 && rep < re.prog[state.pc].rep_min {
+				// println("ist_quant_p UNDER RANGE")
+				m_state = .ist_load // continue the loop
+				continue
+			}
+			// range ok, continue loop
+			else if rep >= re.prog[state.pc].rep_min && rep < re.prog[state.pc].rep_max {
+				// println("ist_quant_p IN RANGE")
+
+				// check greedy flag, if true exit on minimum
+				if re.prog[state.pc].greedy == true {
+					m_state = .ist_next
+					continue
+				}
+				m_state = .ist_load
+				continue
+			}
+			// max reached
+			else if rep == re.prog[state.pc].rep_max {
+				// println("ist_quant_p MAX RANGE")
+				m_state = .ist_next
+				continue
+			}
+		}
+		// UNREACHABLE
+		// println("PANIC4!! state: $m_state")
+		return regex.err_internal_error, state.i
+	}
+
+	// println("Check end of text!")
+	// Check the results
+	if state.match_index >= 0 {
+		if state.group_index < 0 {
+			if re.prog[state.pc].ist == regex.ist_prog_end {
+				// println("program ended!!")
+
+				if (re.flag & regex.f_src) != 0 {
+					// println("find return")
+					return state.first_match, state.i
+				} else {
+					// println("Here!!")
+					return 0, state.i
+				}
+			}
+
+			// println("No Group here, natural end [$state.first_match,$state.i] state: ${state_str(m_state)} ist: $ist pgr_end: $re.prog.len")
+
+			if re.prog[state.pc + 1].ist == regex.ist_prog_end
+				|| re.prog[state.pc].ist == regex.ist_prog_end {
+				rep := re.prog[state.pc].rep
+				// println("rep: $rep re.prog[state.pc].rep_min: ${re.prog[state.pc].rep_min} re.prog[state.pc].rep_max: ${re.prog[state.pc].rep_max}")
+				if rep >= re.prog[state.pc].rep_min && rep <= re.prog[state.pc].rep_max {
+					return state.first_match, state.i
+				}
+				// println("Program not finished! ")
+				return regex.no_match_found, 0
+			}
+			if src_end {
+				// println("program end")
+				return state.first_match, state.i
+			}
+			// print("No match found!!")
+			return regex.no_match_found, 0
+		} else {
+			// println("Group match! OK")
+			// println("first_match: $state.first_match, i: $state.i")
+
+			// println("Skip last group")
+			return state.first_match, state.i
+			// return state.first_match,re.group_stack[state.group_index--]
+		}
+	}
+	// println("no_match_found, natural end")
+	return regex.no_match_found, 0
+}