Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I found a solution without using look-behind, which has the limitation of not being able to match variable length strings (so /(?<!\t*)foo)/ does not work).
#!/usr/local/bin/perl use strict; while (my $str = <DATA>) { chomp($str); $str =~ s/(\d+[.,]\d+ # Substitute a (simple) number ... | # or ... [^.,\d ]+) # something without periods, comma's, # digits or spaces ... ((?!$)[.,]?) # followed by a period or comma, if # possible, but not when at the end of # the line ... /$1$2 /gx; # by the number or string, followed by # the found period or comma, and a # trailing space print "<$str>\n"; } __DATA__ 1,2,a,b a,1,b,2, 1,21,a,b,word,d.3,4.5.6 __END__ <1,2, a, b> <a, 1,b, 2,> <1,21, a, b, word, d. 3,4. 5.6>

In addition to the on-line documentation, you could check out Mastering Regular Expressions, 2nd Edition.

Arjen


In reply to Re: Regex to add space after punctuation sign by Aragorn
in thread Regex to add space after punctuation sign by dda

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 wandering the Monastery: (13)
    As of 2014-07-25 16:02 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (173 votes), past polls