Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
(In perl -de 17:)
DB<6> $x = 'helloworldhellohellohihellohiworldhi' DB<7> print "$1\n" while $x =~ /(\w+)(?=.*\1.*\1)/g hello o l hello h l l o hi h l

The single letters appear, of course, since they're repeated more than once. We can fix that by requiring \1 to be at least 2 characters long...

DB<8> print "$1\n" while $x =~ /(\w{2,})(?=.*\1.*\1)/g hello hello hi
Of course it still finds `world', which appears 4 times.

To autogenerate the regexp:

sub repeat_finder_re { my $n = shift; '(\w{2,})(?=' . ('.*\\1'x($n-1)) . ')' }

In reply to Re: Pattern Finding by ariels
in thread Pattern Finding by artist

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 having an uproarious good time at the Monastery: (7)
    As of 2014-12-22 04:20 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      Is guessing a good strategy for surviving in the IT business?





      Results (110 votes), past polls