This not a regex solution, but perhaps Parse::Range can help you. You feed this module one or more ranges and it returns you a list of the items in these ranges.

use Modern::Perl;
use Parse::Range qw(parse_range);
say join  ' ', sort {$a <=> $b} parse_range('1-2a,27,150b-170,51d2,670
+-675, 12, 90-97, 99-95');

[download]
Output:
12 27 90 91 92 93 94 95 96 97 98 99 670 671 672 673 674 675

[download]
It will warn you about non-numeric ranges:
non-numeric range: '1-2a' at c:/Data/strawberry/perl/site/lib/Parse/Ra
+nge.pm line 54.
non-numeric range: '150b-170' at c:/Data/strawberry/perl/site/lib/Pars
+e/Range.pm line 54.
non-numeric range: '51d2' at c:/Data/strawberry/perl/site/lib/Parse/Ra
+nge.pm line 54.

[download]

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

My blog: Imperial Deltronics

In reply to Re: Looking for a flexible regex... by CountZero
in thread Looking for a flexible regex... 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.