Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I don't know if you can use a split here, because your pattern may not consume characters to achieve what you want.

I've tried this one: m/((?<=.))(?!\1)/ which should be "a position before which there is a character, and after that a different character", but it doesn't work.

Can anybody tell me why this doesn't match the string 'aaabbbc'?

Update: Zoffix told me on IRC that the right thing would be m/(?<=(.))(?!\1)/ (because the assertion is zero-width), however that doesn't work in split as well, because it returns the captured character:

$ perl -MData::Dumper -wle '$Data::Dumper::Indent=0; $_="aaabbc"; prin +t Dumper([split m/(?<=(.))(?!\1)/]);' $VAR1 = ['aaa','a','bb','b','c','c'];

This way you had to discard every second item of the returned list - not pretty either ;-)

In reply to Re: Split a string based on change of character by moritz
in thread Split a string based on change of character by eyepopslikeamosquito

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 exploiting the Monastery: (6)
    As of 2020-10-28 02:37 GMT
    Find Nodes?
      Voting Booth?
      My favourite web site is:

      Results (259 votes). Check out past polls.