Jeong, YunWon ee94b5b723 sre_engine: resume the tail match at prefix_skip, not past the whole prefix (#8473) ...

`search_info_literal`'s len>1 arm reset the tail-match cursor by advancing one
character past the matched prefix. That position equals the INFO block's
prefix_skip boundary only when the prefix ends where the skip does; for a
pattern like `ab(cd)`, `_get_literal_prefix` reports prefix_len=4 with
prefix_skip=2, so the tail resumed two characters too far.

`state.cursor` already holds `req.start + skip`, which is what
`sre_lib.h` SRE(search) computes as `ptr - (prefix_len - prefix_skip - 1)`,
and which the len==1 arm above already uses. Take it unconditionally.

Searching "xabcdcd" for `ab(cd)` returned span (1, 7) instead of (1, 5);
over a 600-case corpus stamped with CPython's own answers, 94 cases disagreed
before this change and none after. The wrong resume also dropped matches
outright, not only widened them.

Assisted-by: Claude

2026-08-09 13:48:48 +09:00

..

tests.rs

sre_engine: resume the tail match at prefix_skip, not past the whole prefix (#8473)

2026-08-09 13:48:48 +09:00