Zugg Software :: View topic - [2.25] %pat is officially broken in %subregex

Wizard Joined: 25 Mar 2003 Posts: 1113 Location: USA

Even the example from the documentation doesn't work, so I don't feel so bad now that I can't make my slightly more complicated call work. The %subregex just returns empty/null strings for any %pat now.

SubAdmin Joined: 18 Nov 2001 Posts: 5187

Yep, subregex was rewritten, and I haven't gotten the full documentation writen for it yet.

You can see my post "Initial subregex documentation" for all of the new features, and also should check the comments for subregex that I wrote for 2.20.

I am aiming at having a good help document done this weekend.

Posted: Wed May 21, 2008 7:54 pm

Yes, and to summarize the solution for others, you need to use \1 .. \99 to refer to subpatterns in the substitution string, just like with normal regular expression substitutions. The %pat function won't work in a substitution string anymore.

Also, using \1..\99 instead of %pat is faster. If your substitution string contains @ or % characters, then CMUD will try to compile it and execute it to expand variables or functions. Using \1..\99 performs the substring substitution internally within the regex routines without calling the CMUD parser, so it is much faster.

The reason %pat doesn't work is that it normally fetches subpatterns from the internal CMUD execution stack, and that execution stack is not being used by the PCRE subregex routine.