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copied!<p>You probably could use greed killer <code>?</code> in your code expression (more info here: <a href="https://stackoverflow.com/questions/7227664/matching-text-between-delimiters-greedy-or-lazy-regular-expression">Matching text between delimiters: greedy or lazy regular expression?</a> ), so if you have a code like this:</p> <pre><code><code>foo</code> another <code>bar</code> </code></pre> <p>It will match just <code>foo</code> and <code>bar</code> not <code>foo</code> another <code>bar</code>, also you should use <a href="http://php.net/manual/en/function.preg-match-all.php" rel="nofollow noreferrer"><code>preg_match_all()</code></a> (with flag <code>PREG_OFFSET_CAPTURE</code>) and write your own parser. Or rather use <a href="http://php.net/manual/en/function.preg-replace-callback.php" rel="nofollow noreferrer"><code>preg_replace_callback()</code></a> like this:</p> <pre><code>// Just strtolower example (this would do formatting) function myCallback( $matches){ return strlower( $matches[2]); } $string = preg_replace_callback("/(&lt;code&gt;).*?(&lt;\/code&gt;)/si", 'myCallback', $string) </code></pre> <p>Note the question-mark in <code>.*?</code>. You also should use <code>s</code> and <code>i</code> modifiers so your code would work on codes like this:</p> <pre><code>lorem ipsum <code> foo </code> bar </code></pre> <p>If you need validation you can use this:</p> <pre><code>$string = preg_replace("/(&lt;code&gt;).*?(&lt;\/code&gt;)/si", '', $string); if( (strpos( $string, '<code') !== false) || (strpos( $string, '</code') !== false){ echo 'Invalid code'; } </code></pre>

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