Add check for (.|\n) any-character alternations - #53
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Flag alternations that match every character by combining . with \n (optionally with extra single-char branches like \r), e.g. (.|\n)*?. Since . already matches all but \n, this is the [\s\S] idiom spelled out as a per-character alternation, which is much slower to match than a single character class. This is the anti-pattern cleaned up in pygments/pygments#3187. New checker 126 (check_dot_newline_alternation), with tests.
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Jul 31, 2026
This is the second time independent PRs collided on the same message id (126 across #52/#53/#54, now 129 across #55-#59). Statically walk each check_/bygroups_check_/groups_check_ function's source for its 'num' assignment and assert none repeat, so a future collision fails CI instead of silently shipping ambiguous warning codes.
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Flag alternations that match every character by combining . with \n (optionally with extra single-char branches like \r), e.g. (.|\n)*?. Since . already matches all but \n, this is the [\s\S] idiom spelled out as a per-character alternation, which is much slower to match than a single character class.
This is the anti-pattern cleaned up in pygments/pygments#3187.
New checker 126 (check_dot_newline_alternation), with tests.