I'm not sure how it works, but someone mentions using qr// instead of
qw// or "" for setting a variable/string that is going to be used in a
RegEx.

Maybe look at 
http://perldoc.perl.org/perlop.html#Quote-and-Quote-like-Operators-operator%2c-quote-operator%2c-quote-like-q-qq-qx-qw-m--qr-s-tr-'-''-%22-%22%22-%2f%2f-%60-%60%60-%3c%3c-escape-sequence-escape
and the section following it.

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