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Add posixCollatingSymbol([.x.]) and posixEquivalenceClass([=x=]) predicates to ParseRegExp.qll, enabling correct tokenization of all three POSIX bracket atom types inside character classes: - [:name:] — already handled, unchanged - [.x.] — new: posixCollatingSymbol predicate - [=x=] — new: posixEquivalenceClass predicate Refactored: - charSetDelimiter: use inAnyPosixBracket helper (covers all three types) - charSet closing: use inAnyPosixBracket helper - inPosixBracket: updated to cover all three types - simpleCharacter: updated to exclude all three types - namedCharacterProperty: includes posixCollatingSymbol and posixEquivalenceClass - inAnyPosixBracket: new private helper; uses pos in [x..y-1] for QL binding Before this commit (commit 6): [[.a.]] → RegExpCharacterClass([[.a.]) + stray ] (WRONG) [[=a=]] → RegExpCharacterClass([[=a=]) + stray ] (WRONG) After this commit: [[.a.]] → RegExpCharacterClass containing RegExpNamedCharacterProperty [.a.] [[=a=]] → RegExpCharacterClass containing RegExpNamedCharacterProperty [=a=] Regenerated parse.expected and regexp.expected via codeql test run --learn (CodeQL 2.26.1); all 2 tests pass.