This code is used to highlight text in a Tk::Text window. This is useful in the context of highlighting some kind of tags, but could be used for any text. By changing a value, you can turn the text highlighting on and off.

Usage (from Tk widget "-command" option):

[\&toggleTextHighlighting \$highlight, \$regex, \$widget]

[download]

Where $highlight equals 1 or 2 (highlighting on or off), $regex is the regular expression used to highlight the text, and $widget is a reference to a Text widget. 

sub toggleTextHighlighting {
    my ($highlight, $regex, $widget) = @_;

    # Deference the variables that you need to get values from
    $highlight = ${$highlight};
    $regex = ${$regex};
    $widget = ${$widget};

    # Create a tag to configure the text
    $widget->tagConfigure('foundtag',
                            -foreground => "white",
                            -background => "red");
    if ($highlight == 1) {
        $widget->FindAll(-regex, -nocase, $regex);
        if ($widget->tagRanges('sel')) {
            my %startfinish  = $widget->tagRanges('sel');
            foreach(sort keys %startfinish) {
                $widget->tagAdd("foundtag", $_, $startfinish{$_});
            }
        $widget->tagRemove('sel', '1.0', 'end');
        }
    } else {
        $widget->tagRemove("foundtag", '1.0', 'end');
    }
}

[download]

In reply to Text Highlighting in Tk::Text window by Rich36

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.