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Re: regex help required

by sundialsvc4 (Abbot)
on Jun 24, 2013 at 13:16 UTC ( #1040437=note: print w/replies, xml ) Need Help??

in reply to regex help required

Indeed.   You must not only determine what it is you do want to match (hence the reply #1:   “what are the relevant parts?”), but also what rules will filter out what you do not want.

Seriously consider using a subroutine to allow for some conditional logic to be used ... (pseudocode follows)

sub my_filter { my $str = shift; my $TRUE = 1; my $FALSE = 0; # FOR CLARITY return $FALSE if ($str =~ /reject_pattern_#1/); return $FALSE if ($str =~ /reject_pattern_#2/); return $TRUE if ($str =~ /accept_pattern_#1/); return $TRUE if ($str =~ /accept_pattern_#2/); return $FALSE; // DOESN'T MATCH ANYTHING }

Then, write a test-program using Test::More which puts your subroutine through many dozens of tests, using a carefully-chosen set of “correct,” “almost correct,” “barely incorrect” and “outright bogus” strings, to prove that your logic is actually trustworthy and reliable.   (Tip:   you will spend a lot more time ferreting-out the little bugs that were lurking in your original version, hoping to remain un-detected, than you originally thought possible.)

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