https://bugs.exim.org/show_bug.cgi?id=1759
Bug ID: 1759
Summary: pcreposix: REG_NOSUB incompatible with POSIX regex
Product: PCRE
Version: 8.31
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
When moving from POSIX regex to PCRE via pcreposix in WeeChat I encountered the
following problem when trying to match "aa" to "^(.)\1$":
* in POSIX regex the pattern compiles when REG_EXTENDED and REG_NOSUB flags are
set with regcomp;
* in pcreposix the pattern does not compile with REG_NOSUB flag set.
I understand that PCRE disables automatic capture numbering when the flag is
set but that causes incompatible behavior with POSIX ERE where the described
pattern with a backreference is completely allowed. This difference is not
really obvious at a higher level because not wanting submatches at regexec
shouldn't mean patterns with backreferences shouldn't compile.
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