In a Text widget, you can use tags to give properties to ranges of characters. You can either set them during insert, or attach them later. The code demonstrates both: 

#!/usr/bin/perl -w
use Tk;
my $top = MainWindow->new;

my $t = $top->Text();
$t->tagConfigure("boring",    -foreground => "blue");
$t->tagConfigure("special",   -foreground => "red");

$t->insert("end", "If you want to be immune from silly letters, don't 
+carry your momomark in your hat.\n");
$t->insert("end", "bij bij\n", "special");
$t->insert("end", "Zoem your Zoem\n", "boring");

my $word = "your";
my $word_len = length $word;
my $next = "1.0";
while (my $from = $t->search(-regexp, "\\b$word\\b", $next, "end")) {
    $next = "$from + $word_len chars";
    $t->tagAdd("special", $from, $next);
}

$t->pack;
MainLoop;

[download]

In reply to Re: Coloring text using TK? by thospel
in thread Coloring text using TK? by Elijah

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.