ok, i'm trying to write a subroutine that will take a numerically sorted array of numbers, and convert any series of 3 or more numbers that incrememnt one by one (ex: 1,2,3 or 926,927,928) and convert them to a string representing a range (ex: 1-3 or 926-928). ive been trying to figure out how to get this to work, but ive about driven myself out of my gourd and i still dont have a working routine...here's an example array:

1,2,8,9,10,11,12,43,66,109,121,122,123,657

and heres what it would look like afterbeing processed by the subroutine:

1,2,8-12,43,66,109,121-123,657

any help is appreciated

Edited 2003-03-19 by mirod: changed the title

In reply to Number lists to number ranges (was: my head is reeling...) 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.