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http://bugs.exim.org/show_bug.cgi?id=1251
Summary: Fails when recursive group comes before reference
Product: PCRE
Version: 8.12
Platform: x86
URL: https://bugs.php.net/bug.php?id=62041
OS/Version: Windows
Status: NEW
Severity: bug
Priority: medium
Component: Code
AssignedTo: ph10@???
ReportedBy: michael@???
CC: pcre-dev@???
The following fails against the string '0:0:0:0::0:255.255.255.255' (without
single-quotes) when it should pass:
/^(?>([a-f0-9]{1,4})(?>:(?1)){5}:|(?!(?:.*[a-f0-9]:){6,})((?1)(?>:(?1)){0,4})?::(?>(?2):)?)(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?3)){3}$/iD
When the reference at offset 84 is switched with the grouping at offset 58 it
passes:
/^(?>([a-f0-9]{1,4})(?>:(?1)){5}:|(?!(?:.*[a-f0-9]:){6,})(?2)?::(?>((?1)(?>:(?1)){0,4}):)?)(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?3)){3}$/iD
I know that the problem is with the ':' (without single-quotes) at offset 88 of
the first example because when I replace it with another character, say an
exclamation mark (and modify the string to test to take this into account) it
passes:
/^(?>([a-f0-9]{1,4})(?>:(?1)){5}:|(?!(?:.*[a-f0-9]:){6,})((?1)(?>:(?1)){0,4})?::(?>(?2)!)?)(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(?>\.(?3)){3}$/iD
Testing: 0:0:0:0::0!255.255.255.255
I have tried replacing ":" with "\:" and "[:]" and it still fails.
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