If you know the name of the param ahead of time, you can let URI::QueryParam do the work instead:

use URI;
use URI::QueryParam;

my $u = URI->new('http://www.com/index.pl?id=<idparm>&etc');
print $u->query_param('id'), "\n";
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UPDATE:
Actually, you don't even have to know the name of the param ahead of time - UPDATE, oops - i didn't quite do this right the first time, here goes again:

my $u = URI->new('http://www.com/index.pl?id=<idparm>&foo=bar&etc');
my @val = grep /<([^>]+)/, map $u->query_param($_), $u->query_param();
print $_,$/ for @val;
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But BrowserUk has a point ... this is waaay overkill! At this point we might as well have just used:

@value = $URL =~ /(<[^>]+>)/;
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But what if it's the key that you want and not the value? What if both keys and values are surrounded with brackets and you only want the keys? Sometimes importing 400 lines of code is better than spending 400 minutes trying to get you own solution correct.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)