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9fd7e949c8
Add new test cases to test.cpp exercising POSIX bracket expressions inside character classes as supported by std::regex ECMAScript mode: - Single POSIX classes: [[:alpha:]], [[:digit:]], [[:space:]], [[:upper:]], [[:lower:]], [[:alnum:]], [[:print:]], [[:punct:]] - Negated outer bracket: [^[:space:]] - Mixed: regular char + POSIX class [a[:space:]] - POSIX collating symbol [[.a.]] - POSIX equivalence class [[=a=]] - Mixed POSIX + range [[:alpha:]0-9] The existing r_posix1-r_posix4 cases remain untouched. New cases use distinct names (r_posix_alpha, r_posix_digit, etc.) to avoid redeclaration. Generated .expected via codeql test run --learn (CodeQL 2.26.1); all 2 tests pass. The expected output captures the CURRENT (pre-fix) tokenization — commit 7 will change these rows when correct POSIX nesting is implemented.