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Re: Identifying if a variable is the product of a qr//

by Rhandom (Curate)
on Apr 25, 2002 at 15:28 UTC ( #161997=note: print w/replies, xml ) Need Help??


in reply to Identifying if a variable is the product of a qr//

The following code throws some light:
perl -e '$qr = "[A-Z]o[A-Z]"; print "[".("WoW" =~ $qr)."][".("wow" =~ +$qr)."]\n";' # prints [1][]


Any string in perl really can be a regular expression. The binding operator allows you to use just about anything that stringifies as a regular expression. That being said, there really isn't anything magical about the Regexp class except that its objects are able to stringify with the appropriate regexp. That basically means, that unless the object is blessed into the Regexp class, there really is no way to know if the object is intended for Regexp use or not. And even if it is not - that doesn't mean that you couldn't use it as one anyway.

I doubt that there is really anything magic going on under the covers that would act specially upon objects formerly blessed as Regexp.

my @a=qw(random brilliant braindead); print $a[rand(@a)];

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[erix]: in this context, one learns all kinds of interesting psychological excuse-jargon: not just 'alternative facts'; how about 'gapped knowledge' ? :)
[erix]: which still manages to sound more or less positive
[Corion]: Huh. I wasn't aware that you cannot segregate Python 2 and Python 3 modules... Hopefully Perl 6 module use C6AN and thus avoid the problem...
[hippo]: I very much hope so.
[moritz]: there are already some (very few) Perl 6 modules on CPAN, but in a way that the p5 indexer avoids them

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