https://bugs.exim.org/show_bug.cgi?id=2325
Bug ID: 2325
Summary: Backreference erroneously seen as both set and unset
in subroutine call
Product: PCRE
Version: 8.42
Hardware: x86
OS: Windows
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: tattarakis@???
CC: pcre-dev@???
This is a weird one. The following matches, as it should:
re: ^(a(?(7)\7))()()()()()(b)(?1)$
str: "abab"
But if you add an empty backreference, it starts to fail:
re: ^(a(?(8)\8))()()()()()()(b)(?1)$
str: "abab"
It appears that (?(8)) correctly succeeds in the subroutine call, as though it
were set, but \8 fails, as though it were unset.
Apologies if this is an old issue fixed in PCRE2. I don't have the means to
test that just yet! Waiting for it to be implemented on regex101.com
All the best,
John Tattarakis
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