I didn't go over your code in detail, but I did notice a common regex error: 
[\w\d]

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Many people (including yours truly at one time), mistakenly assume that \w does not match 0-9. Surprise! It does. This caused me a problem when I was trying to do the following: 
my $text = "product1234imageSmall.jpg";
($type, $id, $property) = ($1, $2, $3) if $text =~ /^(\w+)(\d+)(\w+)/;

[download]
It failed pretty quickly because $type was getting set to product123 (it didn't pick up the "4" because \d had to match something).

In this case, because you are including both \w and \d in a character class, there's only an issue of redundancy and doesn't affect the functioning of the regex. I just wanted to point this out because it's easy to miss that and get bitten in other situations.

Cheers,
Ovid

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In reply to (Ovid - Common regex error) RE: A two-liner for Backtracking for substitutions by Ovid
in thread Backtracking for substitutions by Anonymous Monk

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