I'd like to have a regex to evaluate whether a user has entered a valid string. Valid strings are a comma delimited set of four digit numbers i.e 9500,9501,9502

I'd like to be able to know if a user has entered anything not confirming to that pattern i.e 9500,goats,9501 or 9500,,,,,,,,, that kind of thing.

Here's what I've got so far, it kinda sorta works but doesn't capture everything. Could anyone off any suggestions?

my $string = '9500,9501';

if ($string =~ /^[\d{4}\,]+$/) {
    print "Looks ok\n";
}else {
    print "Not ok\n";
}

[download]

In reply to Validating Comma Delimited String by Anonymous Monk

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.