On Aug 13, 1:47 pm, tobias.wage...@googlemail.com (irata) wrote:
>
> I want to replace in a javscript structure like the one below every
> occurence of "{#...}", "{?...}", "{+...}" and "{=...}" through
> something different (also nested):
> function() {
> test1 = "{#Caption}";
> test2 = "{#Te{?st}}";
> test3 = "{+date.{0}}";
> }
>
> with this regular expression
> my( $open ) = qr/{[=+#?]/;
> my( $close ) = qr/}/;
> my( $not ) = qr/[^{}]++/;
> do {
> $found = $text =~ s/
> (
> $open
> (?: $not | (?1) )
> $close
> )
> /replace($1)/esxg;
> } while ( $found );
> I can handle case "test1" and "test2" but the case "test3" won't work.
> Could some help me how I can change the expression that it match
> "{+date.{0}}" without bothering about the "{0}" (this could also be
> "{foo}").
>
> I try it with:
> my( $not ) = qr/(?>(?:(?!$open)|(?!$close))+)/;
> but that won't work.
>
[Your question would probably be better posted in
comp.lang.perl.misc]
One good debugging technique to track what the regex
engine is doing: use re 'debug'
I believe the problem is that once the inner {0} is found
the recursion pattern fails because $open is {[=+#?] and
{0} won't match.
You could perhaps make it work by checking whether
you're recursing to alter the pattern accordingly:
untested tweak:
my( $open ) = qr/ (? (R) [=+#?] | [=+#?]? ) /x;
clear as mud?
--
Charles DeRykus
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