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

[Ferret]

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 ;-)

[elusion]

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

[ctgIT]

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

[elusion]

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