in reply to use of built-in function in regex...
Yes. You can use (?{CODE}) inside your regular expression. For more on this please look in to http://perldoc.perl.org/perlretut.html#A-bit-of-magic:-executing-Perl-code-in-a-regular-expression.
Regards,
Murugesan Kandasamy
use perl for(;;);
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