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From: "bugdal at aerifal dot cx" <sourceware-bugzilla@sourceware.org> To: glibc-bugs-regex@sourceware.org Subject: [Bug regex/52] Repeated and nested subexpressions (reproducible in most other engines) Date: Thu, 04 Jul 2013 07:51:00 -0000 [thread overview] Message-ID: <bug-52-132-COtDEXPSmV@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-52-132@http.sourceware.org/bugzilla/> http://sourceware.org/bugzilla/show_bug.cgi?id=52 --- Comment #14 from Rich Felker <bugdal at aerifal dot cx> --- On Thu, Jul 04, 2013 at 07:42:51AM +0000, bonzini at gnu dot org wrote: > Unices. Also, even though it is not POSIX RE, Perl regular expressions have > the same behavior. Perl RE's are so different from POSIX that I would not consider them in this discussion. > Thanks for mentioning musl's matcher, I'll check it out. The upstream source we got it from, TRE, is where the magic came from. The author has some good documentation on how it works. > Matching backreferences at a decent speed _and_ obeying the POSIX > leftmost/longest rules is very hard to do. Currently the speed is somewhat less than glibc, but not horrible by any means. A large part of the cost is probably mbtowc. I'm planning to eventually adapt it to compile the UTF-8 RE directly to a byte-based state machine with actual character identity decoding only when matching against character classes, but it's low priority right now. -- You are receiving this mail because: You are on the CC list for the bug.
next prev parent reply other threads:[~2013-07-04 7:51 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-52-132@http.sourceware.org/bugzilla/> 2012-03-08 4:59 ` carlos at systemhalted dot org 2013-07-03 21:25 ` eblake at redhat dot com 2013-07-04 0:28 ` bugdal at aerifal dot cx 2013-07-04 3:37 ` carlos at redhat dot com 2013-07-04 3:38 ` carlos at redhat dot com 2013-07-04 7:22 ` bonzini at gnu dot org 2013-07-04 7:35 ` bugdal at aerifal dot cx 2013-07-04 7:42 ` bonzini at gnu dot org 2013-07-04 7:51 ` bugdal at aerifal dot cx [this message] 2013-07-04 8:04 ` bonzini at gnu dot org 2013-07-04 15:05 ` eggert at gnu dot org 2014-01-31 9:15 ` afaq.ahmed at agilosoft dot com
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