Change your if conditional line with the regex to this:

if ($content =~ /$start\s*(.*?)\s*$end/) {
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you really don't have to have the word boundaries, and you should always expect possible white space.

Remember, TIMTOWTDI

Jeff

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
F--F--F--F--F--F--F--F--
(the triplet paradiddle)