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Re: creating qr from existing regex

by vr (Curate)
on Feb 09, 2018 at 11:15 UTC ( #1208812=note: print w/replies, xml ) Need Help??

in reply to creating qr from existing regex

Not an answer, just a comment. Do I get it right:

  • "setter" (in quotes, because I understand it's not really a setter) accepts a compiled regex, one you build with the qr operator;
  • "getter" returns not this compiled regex, but, somehow, Perl source code fragment, literal string 'qr/.*uba$/i'. Which you then are trying to parse. Or, where does this 'qr/.*uba$/i' come from, and why is it necessary to manually parse Perl expression?

It doesn't make much sense to me, but I haven't worked with MongoDB, hence not an answer, but a promised comment. The reason you get an undef in OP, is because $re are 2 separate lexical variables, 1 per each own small block. They are declared with my and destroyed at closing curly bracket. What's assigned to $_[0], in next line, is presumably global, completely different $re, and undefined at that time. You don't use strict;, do you? I think this change

my $re; if($2 eq 'i'){ $re = qr/$_[0]/i; }else{ $re = qr/$_[0]/; } $_[0] =$re;

would give you the result you were hoping for.

Edit: Fixed numeric comparison operator to string comparison eq (thanks, poj).

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