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feat: add support for 'a' (ASCII) and 'L' (LOCALE) regex flags - #1655
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Adds support for the 'a' and 'L' regex flags in Lark grammars, as requested in issue lark-parser#1527. - 'a' flag: Makes \w, \W, \b, \B, \d, \D, \s, \S perform ASCII-only matching instead of full Unicode matching - 'L' flag: Makes \w, \W, \b, \B locale dependent (only works with bytes patterns in Python 3) Changes: - Updated _RE_FLAGS in load_grammar.py to include 'a' and 'L' - Added test_flag_order_with_new_flags to verify 'a' flag works - Added test_token_flags_ascii to verify 'a' flag parses correctly
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This was referenced Sep 20, 2026
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Summary
Adds support for the
a(ASCII) andL(LOCALE) regex flags in Lark grammars, as requested in issue #1527.Changes
_RE_FLAGSinload_grammar.pyto includeaandLtest_flag_order_with_new_flagsto verify theaflag works and is sorted deterministicallytest_token_flags_asciito verify theaflag parses correctlyDetails
aflag (ASCII): Makes\w,\W,\b,\B,\d,\D,\s,\Sperform ASCII-only matching instead of full Unicode matching. Works with both string and bytes patterns.Lflag (LOCALE): Makes\w,\W,\b,\Blocale dependent. Note: In Python 3, this flag can only be used with bytes patterns (whenuse_bytes=True).Testing
All existing tests pass, and new tests verify the flags work correctly:
Closes #1527