http://www.perlmonks.org?node_id=1012698

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question: 

ntv.com/very-own/
ntv.com/business/
ntv.com.wid-prl.com/very-own/
ltv.com/very-own/

[download]
Please tell me how to write a single regex which matches all the above conditions.

Replies are listed 'Best First'.
Re: Single regex
by choroba (Cardinal) on Jan 10, 2013 at 16:54 UTC
    You probably do not want to see 
    /.*/

    [download]
    or 
    m{^(?: ntv\.com/very-own/
     | ntv\.com/business/
     | ntv\.com\.wid-prl\.com/very-own/
     | ltv\.com/very-own/
   )$}x

    [download]
    as the answers. Tell us more: What conditions should it not match? What are you trying to achieve?
    لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
[reply]
[d/l]
[select]
Re: Single regex
by BrowserUk (Patriarch) on Jan 10, 2013 at 16:57 UTC 

    print "$_: ", m[[nl]tv\.(?:com\.wid-prl\.)?com/(?:business|very-own)/]
+ ? 'matches' : 'nomatch' 
for qw[
 ntv.com/very-own/
 ntv.com/business/
 ntv.com.wid-prl.com/very-own/
 ltv.com/very-own/
];;
ntv.com/very-own/:  matches
ntv.com/business/:  matches
ntv.com.wid-prl.com/very-own/:  matches
ltv.com/very-own/:  matches

    [download]
    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
[reply]
[d/l]
      good code, but I would add ^ and $
      m[^[nl]tv\.(?:com\.wid-prl\.)?com/(?:business|very-own)/$]
[reply]
[d/l]
Re: Single regex
by clueless newbie (Curate) on Jan 10, 2013 at 18:03 UTC

    Using Regexp::Assemble

    use strict;
use warnings;

use Regexp::Assemble;

my $re=Regexp::Assemble->new();
$re->add('ntv\.com/very-own/');
$re->add('ntv\.com/business/');
$re->add('ntv\.com.wid-prl.com/very-own/');
$re->add('ltv\.com/very-own/');
print $re->re."\n";

    [download]

    produces

    (?^:(?:ntv\.com(?:\/(?:business|very-own)|.wid-prl.com\/very-own)|ltv\.com\/very-own)\/)
[reply]
[d/l]
Re: Single regex
by muba (Priest) on Jan 10, 2013 at 16:57 UTC
    m(ntv\.com/(very-own|business)/(ntv\.com\.wid-prl\.com|ltv\.com)/very-own/)
[reply]
[d/l]
Re: Single regex
by 0day (Sexton) on Jan 10, 2013 at 17:01 UTC
    /^*tv\.com.+?/si
[reply]
[d/l]
Re: Single regex
by Anonymous Monk on Jan 11, 2013 at 02:37 UTC
[reply]

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