https://bugs.exim.org/show_bug.cgi?id=2209
Bug ID: 2209
Summary: Pattern does not match while it should (works with
internal optimizations turned off)
Product: PCRE
Version: 8.41
Hardware: x86
OS: All
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: p...@hermes.cam.ac.uk
Reporter: firas....@gmail.com
CC: pcre-dev@exim.org
The pattern "(?=(a))\1?b" matched agains "ab" fails, while it should match.
Making the backref non-optional, or adding an anchor solves it. If you use the
PCRE_NO_START_OPTIMISE flag it works.
See https://regex101.com/r/wOft3k/1
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