To avoid throwing stuff in $1 when you don't need to, there is a great feature called clustering in REs with the (?:stuff here) stuff :).
Just change /<a href="(mailto:)?([^"]*)">([^<"]*)<\/a>/g
to /<a href="(?:mailto:)?([^"]*)">([^<"]*)<\/a>/g
And that way nothing will be put in $1.
You may also want to consider chomping $2 and $3 because a newline could get in there somewhere and cause some trouble. Hope I helped out. :):):) Later
$_.=($=+(6<<1));print(chr(my$a=$_));$^H=$_+$_;$_=$^H;
print chr($_-39); # Easy but its ok.
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