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cpython/Modules
Bernát Gábor c79e18a8e5 gh-150717: Avoid mark-array allocation for groupless regex patterns (GH-150719)
state_init() always did PyMem_New(state->mark, groups*2), which for a
pattern with no capturing groups is PyMem_Malloc(0) -- a real allocation
(plus matching free) on every match/search/fullmatch call, for an array
that is never read: groupless patterns emit no MARK opcodes and group 0's
span is taken from state->start/ptr.

Guard the allocation with `if (pattern->groups)`. state->mark stays NULL
(set by the preceding memset), and both the error path and state_fini
already PyMem_Free(NULL) safely.
2026-06-02 10:45:30 +03:00
..

Source files for standard library extension modules,
and former extension modules that are now builtin modules.