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Re: Re: regex (?{CODE}) question

by Ferret (Scribe)
on Aug 01, 2002 at 19:34 UTC ( #186901=note: print w/replies, xml ) Need Help??


in reply to Re: regex (?{CODE}) question
in thread regex (?{CODE}) question

And don't forget, since you're referring to a capture while still in the regex, it hasn't set $1 yet, so you have to use \1 instead:

 (?{ print $1, "\n" })

would need to be

 (?{ print \1, "\n" })

unless there's something special about the codeblock I'm not aware of?

Update: Strike that, reverse it, elusion's correct. Make sure you don't do anything silly like using \1 instead of $1 ;-)

Replies are listed 'Best First'.
Re: Re: Re: regex (?{CODE}) question
by elusion (Curate) on Aug 01, 2002 at 19:37 UTC
    While in a code block, $1 is correct. This is necessary because it's executed as actual code. I'm not sure how \1 would actually parse, though I assume it'd be a reference to 1.

    elusion : http://matt.diephouse.com

      Thanks for your reply. Actually, my objective is not to print $1 but to call a subroutine from inside the replace part of the regex which will use the value of $1 to produce a string that will be used in the replace part. For example, something like:
      $str = "(<citationref linkend=\" cit314-1 cit314-2 cit314-3 cit314-4 c +it314-5\"/>)"; if( $str =~ s/<ref links=\"(.*?)\"(.*?)\/>/<ref links=\"$1\"$2>(?{ &ge +tString($1) })<\/ref>/ ){ print "Match was found." . "\n"; } print $str . "\n"; sub getString($s){ my $s = shift; ...more processing of $s... return $s; }
      Thanks,
      Christos
        Try using the /e modifier. What it does is make the second half of the regex executed as code. In your case you'd want something like this:
        $str = "(<ref links=\" cit314-1 cit314-2 cit314-3 cit314-4 cit314-5\"/ +>)"; if( $str =~ s/<ref links="(.*?)"(.*?)\/>/ "<ref links=\"$1\"$2>" . getString($1) . "<\/ref>"/e ){ print "Match was found." . "\n"; } print $str . "\n"; sub getString($s){ my $s = shift; ...more processing of $s... return $s; }
        Your $str changed from your previous posts, so I changed it back to the way it was in the other posts. Notice how I quoted the tags and concatenated them with the return value from the subroutine. I also did some extra formatting. Hope this helps.

        elusion : http://matt.diephouse.com

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