Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

The reason taking the quotemeta out fixed the problem is that a quotemeta-ed string that contained  \W characters will, in general (there may be some oddball corner cases), not regex-match with itself after the string has been double-quote-ishly interpolated into a regex. The reason is that after a string is quotemeta-ed, something like  '\-' in the quotemeta-ed string is literally a backslash-hyphen sequence of characters, but this sequence in a regex only matches a hyphen leaving the backslash in the quotemeta-ed string unmatched.

>perl -wMstrict -le "my $s = 'a-b c*d'; my $qm_s = quotemeta $s; print qq{raw: '$s' quotemeta-ed: '$qm_s'}; ;; printf qq{%s equal \n}, $qm_s eq $qm_s ? '' : 'NOT '; printf qq{%s match \n}, $qm_s =~ /$qm_s/ ? '' : 'NO '; " raw: 'a-b c*d' quotemeta-ed: 'a\-b\ c\*d' equal NO match

In reply to Re^3: RegEx Matching, Loop Breaking... by AnomalousMonk
in thread RegEx Matching, Loop Breaking... by rardoe

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others perusing the Monastery: (10)
    As of 2014-07-10 10:05 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      When choosing user names for websites, I prefer to use:








      Results (205 votes), past polls