5 Commits

Author	SHA1	Message	Date
Yukihiro "Matz" Matsumoto	78d761addf	mruby-regexp: implement extended mode (x flag) ... The x flag ignores unescaped whitespace and #comments in patterns, making complex regexps more readable. Whitespace inside character classes [...] remains literal. Implemented as a preprocessing step that strips whitespace/comments before compilation. Co-authored-by: Claude <noreply@anthropic.com>	2026-04-23 19:25:30 +09:00
Yukihiro "Matz" Matsumoto	3c68e49178	mruby-regexp: add lookahead assertions (?=...) and (?!...) ... implement positive and negative lookahead in the backtracking engine: - (?=pattern): succeeds if pattern matches at current position without consuming characters - (?!pattern): succeeds if pattern does NOT match at current position new bytecodes RE_LOOKAHEAD and RE_NEG_LOOKAHEAD implemented in the backtracking engine via nested bt_match calls. Co-authored-by: Claude <noreply@anthropic.com>	2026-04-23 19:25:29 +09:00
Yukihiro "Matz" Matsumoto	7283560215	mruby-regexp: add named captures (?<name>...) ... support named capture groups in patterns: - compiler parses (?<name>...) syntax and builds name table - MatchData#[:name] and MatchData#["name"] access by name - MatchData#named_captures returns {name => value} hash - Regexp#named_captures returns {name => group_number} hash - named captures stored in mrb_regexp_pattern for GC safety Co-authored-by: Claude <noreply@anthropic.com>	2026-04-23 19:25:28 +09:00
Yukihiro "Matz" Matsumoto	8d92379d7c	mruby-regexp: fix non-greedy quantifiers (*?, +?, ??) ... non-greedy patterns now correctly match the shortest possible string. patterns with non-greedy quantifiers are dispatched to the backtracking engine which naturally handles non-greedy semantics. the Pike VM continues to be used for purely greedy patterns (O(n*m) guarantee). Co-authored-by: Claude <noreply@anthropic.com>	2026-04-23 19:25:28 +09:00
Yukihiro "Matz" Matsumoto	1cfa153ff3	mruby-regexp: add built-in regexp engine with Pike VM ... implement a lightweight NFA-based regular expression engine for mruby: engine (src/re_compile.c, src/re_exec.c, src/re_utf8.c): - Pike VM (Thompson NFA simulation) with O(n*m) time guarantee - ReDoS-resistant by design (no backtracking for basic patterns) - supports: literals, ., *, +, ?, {n,m}, [], [^], |, () - character classes: \d, \w, \s and negations - anchors: ^, $, \A, \z, \Z, \b, \B - flags: i (ignorecase), m (multiline/dotall) - captures with MatchData Ruby API (src/regexp.c, mrblib/string_regexp.rb): - Regexp.new, #match, #match?, #=~, #===, #source, #inspect - Regexp.escape, Regexp::IGNORECASE/MULTILINE constants - MatchData#[], #captures, #to_a, #begin, #end, #pre_match, #post_match - String#match, #match?, #=~, #sub, #gsub, #scan, #split ~1700 lines of C + ~120 lines of Ruby. no external dependencies. Co-authored-by: Claude <noreply@anthropic.com>	2026-04-23 19:25:27 +09:00