What is the best way to find out if a given string is a valid color? I am writing a Perl/TK program that will read in a file which contains color names. Users might not be aware of which names are allowed, or could mis-type something.

It seems to me that I could compare with names from the list which on my Linux machine is in /usr/share/X11/rgb.txt (and add a check for colors of the form #rrggbb, no reason to exclude those). Can I expect that list to be standard on all systems (Linux, Windows, Macs)? Even if it is standard, is that the best way to do it?

Certainly, if I use an incorrect color name, I get an error message. Could I make use of the verification system being used there, and if so, how?

In reply to Best way to validate a string as a color? by pra

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.