I think I understand what you're trying to do here. While I don't have the brain cycles to process the exact regexp you have there, could it be that the problem you're seeing is just because you're using double quotes (") when you should be using a single quote ('), in the hash definition?
my %taglist_complex = (
'email' => "<a href='mailto:$1'>$2</a>",
'url' => "<a href='$1'>$2</a>",
'img' => "<img src='$1' alt='$2' />"
);
$1 and $2 are getting extrapolated in this definitions, while I think you mean to have them there as literals.
-- Dan
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