Hi all,
I already checked the archives for this issue and it seems I am not the first to ask: http://common-lisp.net/pipermail/regex-coach/2005-April/000282.html
The response from Edi at that time: "Standalone" regular expressions ("atomic grouping") as in (?>x+) are supported, possesive quantifiers as in x++ aren't because they aren't in Perl and CL-PPCRE tries to be compatible with Perl.
That was in 2005. Indeed, using an older Perl: % perl -e "print 'no' if '123456' !~ /\d++6/" Nested quantifiers in regex; marked by <-- HERE in m/\d++ <-- HERE 6/ at -e line 1. % perl -v This is perl, v5.8.3 built for sun4-solaris ...
However, now Perl has changed: >perl -le "print 'no' if '123456' !~ /\d++6/" no >perl -v This is perl, v5.10.0 built for MSWin32-x86-multi-thread ...
Could be a limitation of CL-PPCRE or could be that the Regex Coach only needs updated, I'm not sure on this.
Regards Ben Golding
On Mon, Feb 16, 2009 at 5:33 PM, Ben Golding bengolding@fastmail.fm wrote:
I already checked the archives for this issue and it seems I am not the first to ask: http://common-lisp.net/pipermail/regex-coach/2005-April/000282.html
The response from Edi at that time: "Standalone" regular expressions ("atomic grouping") as in (?>x+) are supported, possesive quantifiers as in x++ aren't because they aren't in Perl and CL-PPCRE tries to be compatible with Perl.
That was in 2005. Indeed, using an older Perl: % perl -e "print 'no' if '123456' !~ /\d++6/" Nested quantifiers in regex; marked by <-- HERE in m/\d++ <-- HERE 6/ at -e line 1. % perl -v This is perl, v5.8.3 built for sun4-solaris ...
However, now Perl has changed:
perl -le "print 'no' if '123456' !~ /\d++6/"
no
perl -v
This is perl, v5.10.0 built for MSWin32-x86-multi-thread ...
Could be a limitation of CL-PPCRE or could be that the Regex Coach only needs updated, I'm not sure on this.
There's currently no support for this in CL-PPCRE and I have no immediate plans to follow Perl's lead closely unless someone funds the work.
Sorry, Edi.
-
Ben Golding -
Edi Weitz