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    <p>To do this with <a href="http://search.cpan.org/perldoc?HTML%3a%3aTreeBuilder" rel="nofollow">HTML::TreeBuilder</a>, you would read the file, modify the tree, and write it out (to the same file, or a different file). This is fairly complex, because you're trying to convert part of a text node into a tag, and because you have comments that can't move.</p> <p>A common idiom with HTML-Tree is to use a recursive function that modifies the tree:</p> <pre><code>use strict; use warnings; use 5.008; use File::Slurp 'read_file'; use HTML::TreeBuilder; sub replace_keyword { my $elt = shift; return if $elt-&gt;is_empty; $elt-&gt;normalize_content; # Make sure text is contiguous my $content = $elt-&gt;content_array_ref; for (my $i = 0; $i &lt; @$content; ++$i) { if (ref $content-&gt;[$i]) { # It's a child element, process it recursively: replace_keyword($content-&gt;[$i]) unless $content-&gt;[$i]-&gt;tag eq 'a'; # Don't descend into &lt;a&gt; } else { # It's text: if ($content-&gt;[$i] =~ /here/) { # your keyword or regexp here $elt-&gt;splice_content( $i, 1, # Replace this text element with... substr($content-&gt;[$i], 0, $-[0]), # the pre-match text # A hyperlink with the keyword itself: [ a =&gt; { href =&gt; 'http://example.com' }, substr($content-&gt;[$i], $-[0], $+[0] - $-[0]) ], substr($content-&gt;[$i], $+[0]) # the post-match text ); } # end if text contains keyword } # end else text } # end for $i in content index } # end replace_keyword my $content = read_file('foo.shtml'); # Wrap the SHTML fragment so the comments don't move: my $html = HTML::TreeBuilder-&gt;new; $html-&gt;store_comments(1); $html-&gt;parse("&lt;html&gt;&lt;body&gt;$content&lt;/body&gt;&lt;/html&gt;"); my $body = $html-&gt;look_down(qw(_tag body)); replace_keyword($body); # Now strip the wrapper to get the SHTML fragment back: $content = $body-&gt;as_HTML; $content =~ s!^&lt;body&gt;\n?!!; $content =~ s!&lt;/body&gt;\s*\z!!; print STDOUT $content; # Replace STDOUT with a suitable filehandle </code></pre> <p>The output from <code>as_HTML</code> will be syntactically correct HTML, but not necessarily nicely-formatted HTML for people to view the source of. You can use <a href="http://search.cpan.org/perldoc?HTML%3a%3aPrettyPrinter" rel="nofollow">HTML::PrettyPrinter</a> to write out the file if you want that.</p>
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    1. POHow can I modify HTML files in Perl?
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    1. POHow can I modify HTML files in Perl?
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    1. COWOOOOOOOOOOOOOOOOOOOOOOOOW! Seriously man, where did you come from? I couldnt ask for a better solution! Amazing. It works perfect, but not I will need few hours to understand what you did there (-: Thanks a lot!
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    2. COI use HTML-Tree quite a bit. Also, the `substr` expressions are just copied out of the docs for `@-`, because using `$&`, etc. slows down your program.
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    3. COYou might also search for other StackOverflow questions that ask the same thing (and often have the same answer). HTML::TreeBuilder makes frequent appearances here.
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