Hi I'm new here. I had search days on the task I want to perform but I don't know what exactly it is called and can't find it so I have to ask for help.

Task: To split a string into equal fixed characters using regex

Problem: Modify current regex so result would appear in reverse order as "111-111-1" instead "1-111-111".

I prefer to use regex, not to use reverse function.

I couldn't remember where exactly I found below regex before, it works perfectly. Only now I want to make another version out of it so I can perform as I mentioned above.

$line =~ s/(?<=\w)(?=(?:\w\w\w)+\b)/-/g; 
--- Perl sample codes -----

my (@list) = ( "12", "123", "1234", "12345",
"123456", "1234567", "234", "2345", "23456" );

foreach $line (@list)
{
$line =~ s/(?<=\w)(?=(?:\w\w\w)+\b)/-/g;
print "$line<br>";
}

[download]
--- results of above code
12
123
1-234
12-345
123-456
1-234-567
234
2-345
23-456

[download]

I want it appear as:

123-4
123-45
123-456
123-456-7

[download]

Many thanks in advance.

In reply to Regex split string into n-length by hankcoder

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.