I have a scalar variable, and below are some examples of the values that may be in the variable:

1,2,3,4
8,9,10,11
7,8,9,10
12,13,14,15

Basically, what I'd like to do is to put a zero before any single digit (i.e., 9 becomes 09, 8 becomes 08, 10 stays 10, and so on). So, I know I can do this by splitting the scalar into an array, then go through each value of the array and say if ($value =~ /(\d)/) then make it 0$1, and then put it all back together. However, I am wondering if there is any way I can do it without splitting the scalar. For example, 8,9,10,11 becomes 08,09,10,11. I have the following code, but it only works in situations where they are all single digits (e.g., 1,2,3,4): 
if ( $channels =~ /(\d,)(\d,)(\d,)(\d)/ ) {
    $channels = "0${1}0${2}0${3}0$4";
}

[download]

In reply to Replacing matches within string without splitting. by walkingthecow

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.