Well, there's a few ways to go at it that I can think of: 
$name =~ s/(.*?\s.*?\s.*?\s.*?)\s/$1\n/;

[download]
basicly, we want to take a few characters off as possible, and count our spaces... also, we have to save the first part of the replacement (hence the ()'s), since we don't want to throw it away.

we should allow for multiple spaces in a row, since I think those should count as one: 

$name =~ s/(.*?\s+.*?\s+.*?\s+.*?)\s+/$1\n/;

[download]
You could also write the same thing here as: 
$name =~ s/((?:.*?\s+){3}.*?)\s/$1\n/;

[download]
and just repeat a section 3 times. A similar approach would be to replace the .*? parts with \S+ - I think this will be faster, as the regex engine will have less options on how ot match: 
$name =~ s/((?:\S+\s+){3}\S+)/$1\n/;

[download]
Hope that helps! See man perlre for lots more info!

-- Dan

In reply to Re: Need help with regex to replace 4th \s with \n in data line by zigdon
in thread Need help with regex to replace 4th \s with \n in data line by Popcorn Dave

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!
  • 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, details, 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, summary, 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.