Something like this may do the job:

use strict; use warnings; use feature qw/ :5.10 /; my @str = ("j k l foobar", "foobar", "jkl foobar", "1 2 3", + "jk l foobar", "foobar j k l", "foobar j kl", " ", " ", "j + jk foobar", "j k jk foobar", "j k l"); my $rx = qr/^((?:\w(?:\s+|\z))*)(.*)/; for my $str (@str){ my ($i,$s) = $str =~ /$rx/; $i =~ s/\s+//g; say $i ? join " ",$i,$s : $s; }


jkl foobar foobar jkl foobar 123 jk l foobar foobar j k l foobar j kl j jk foobar jk jk foobar jkl


In reply to Re: String manipulation by citromatik
in thread String manipulation by abhy

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.