Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
:) Ok, now that I better understand what you're asking, here's my regex solution. I think that this improves upon some other methods by starting with the longest and working down to the shortest, (quitting as soon as a match is found).

use strict; use warnings; my @array = ( "this is a string is", "a string this is", "tie a string together" ); my $string = join "|", @array; my $repeat = '\|.*?\1.*?' x ( scalar(@array) - 1 ); for my $n ( reverse ( 1 .. length( $string ) ) ) { next unless $string =~ /(.{$n}).*?$repeat/; print $1, "\n"; last; }

Ob-Update: This assumes the substrings don't overlap. And I've tinkered with the code to make it keep track of what the original substrings looked like. In so doing, I used the | character as a delimiter, which means it shouldn't appear in the original substrings. Thanks danger for the polite nudge. ;)


"If I had my life to live over again, I'd be a plumber." -- Albert Einstein

In reply to Re: Re: Re: finding longest common substring by davido
in thread finding longest common substring by revdiablo

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            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?

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

    How do I use this? | Other CB clients
    Other Users?
    Others scrutinizing the Monastery: (3)
    As of 2020-11-30 06:02 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found