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[Bug regex/14301] Regular expression wrong match with a number of groups
- From: "fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs-regex at sources dot redhat dot com
- Date: Wed, 27 Jun 2012 08:32:43 +0000
- Subject: [Bug regex/14301] Regular expression wrong match with a number of groups
- Auto-submitted: auto-generated
- References: <bug-14301-132@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14301
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
CC| |fweimer at redhat dot com
Resolution| |INVALID
--- Comment #3 from Florian Weimer <fweimer at redhat dot com> 2012-06-27 08:32:43 UTC ---
(In reply to comment #2)
> (In reply to comment #1)
> > (4[0-9]{12}) matches 4123456789012.
>
> So what?
> Regular expression required leading and trailing space to be present for match.
I don't think so. "|" does not bind this way. a[b]|c|d[e] is equivalent to
(ab)|c|(de), not (a)(b|c|d)(e).
> Also please note, that in case 3 and 4 regular expressions are essentially the
> same - only (4[0-9]{15}) and (4[0-9]{12}) that connected with OR swapped.
This also explains the difference when swapping the parenthesized constructs.
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