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    <p><em>Please note</em>: this is <em>not</em> an attempt to provide a fix for the regex. It is just here to show how difficult it is (dare I say impossible) to create a regex that will successfully parse HTML. Even well structured XHTML would be nightmarishly difficult, but poorly structured HTML is a no-go for regular expressions.</p> <p>I agree 100% that using regular expressions to attempt HTML parsing is a very bad idea. The following code uses the supplied function to parse some simple HTML tags. It trips up on its second attempt when it finds the nested HTML tag <code>&lt;em&gt;Test&lt;em&gt;</code>:</p> <pre><code>$t['label'] = 'Test'; $text = '&lt;p&gt;Test&lt;/p&gt;'; $find = '/(?![^&lt;]+&gt;)(?&lt;!\w)(' . preg_quote($t['label']) . ')\b/s'; $text = preg_replace_callback($find, 'replaceCallback', $text); echo "Find: $find\n"; echo 'Quote: ' . preg_quote($t['label']) . "\n"; echo "Result: $text\n"; /* Returns: Find: /(?![^&lt;]+&gt;)(?&lt;!\w)(Test)\b/s Quote: Test Result: &lt;p&gt;&lt;a class="tag" rel="tag-definition" title="Click to know more about Test" href="?tag=Test"&gt;Test&lt;/a&gt;&lt;/p&gt; */ $t['label'] = '&lt;em&gt;Test&lt;/em&gt;'; $text = '&lt;p&gt;Test&lt;/p&gt;'; $find = '/(?![^&lt;]+&gt;)(?&lt;!\w)(' . preg_quote($t['label']) . ')\b/s'; $text = preg_replace_callback($find, 'replaceCallback', $text); echo "Find: $find\n"; echo 'Quote: ' . preg_quote($t['label']) . "\n"; echo "Result: $text\n"; /* Returns: Find: /(?![^&lt;]+&gt;)(?&lt;!\w)(Test)\b/s Quote: Test Result: &lt;p&gt;&lt;a class="tag" rel="tag-definition" title="Click to know more about Test" href="?tag=Test"&gt;Test&lt;/a&gt;&lt;/p&gt; Warning: preg_replace_callback() [function.preg-replace-callback]: Unknown modifier '\' in /test.php on line 25 Find: /(?![^&lt;]+&gt;)(?&lt;!\w)(\&lt;em\&gt;Test\&lt;/em\&gt;)\b/s Quote: \&lt;em\&gt;Test\&lt;/em\&gt; Result: */ function replaceCallback($match) { if (is_array($match)) { $htmlVersion = $match[1]; $urlVersion = urlencode($htmlVersion); return '&lt;a class="tag" rel="tag-definition" title="Click to know more about ' . $htmlVersion . '" href="?tag=' . $urlVersion . '"&gt;' . $htmlVersion . '&lt;/a&gt;'; } return $match; } </code></pre>
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    1. COok, i think i got it, html is not regular enough for regular expressions :) But then, how would you go about replacing words by hyperlinks in an html content?
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    2. CO@pixeline: :-) Sorry to hammer it in - it's just a question that comes up a lot all over the place. Regexes can seem like a good idea at first, but rarely work. Anyway, you should probably try the [DOM functions](http://www.php.net/manual/en/book.dom.php) in PHP. The [PHPro Parse HTML With PHP And DOM](http://www.phpro.org/examples/Parse-HTML-With-PHP-And-DOM.html) tutorial may help too.
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    3. CO@pixeline Questions like yours come up at least three times a day. Search for *replace attributes in HTML* or similar keywords or just browse the questions a few pages back. The key lib you want is DOM.
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