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run code in 200+ php & hhvm versions
Bugs & Features
<?php $pre ="<a href=\""; $post= "</a>"; $in = array('http://">http', 'ftp://">ftp', 'mailto://">mailto', '#">HASH', '//">2xfw slash', '\\\\">2x Bw slash', 'file://">file' ); $replacements = array('/((?:href|src) *= *[\'"](?!(http|ftp|mailto|file|javascript|#|[a-z]+:|'. preg_quote('\\\\',"/"). '|\/\/)))(\/?)/i' => "$1" . "xxxxABSOLUTE/PATH/" ); foreach($in as $test) { echo '<br><pre>\n'; $r = $pre . $test . $post; echo "$r =>" . preg_replace(array_keys($replacements), $replacements, $r); echo '</pre>'; }
based on ci9ak
Output for 4.3.0 - 7.2.0
<br><pre>\n<a href="http://">http</a> =><a href="http://">http</a></pre><br><pre>\n<a href="ftp://">ftp</a> =><a href="ftp://">ftp</a></pre><br><pre>\n<a href="mailto://">mailto</a> =><a href="mailto://">mailto</a></pre><br><pre>\n<a href="#">HASH</a> =><a href="#">HASH</a></pre><br><pre>\n<a href="//">2xfw slash</a> =><a href="//">2xfw slash</a></pre><br><pre>\n<a href="\\">2x Bw slash</a> =><a href="\\">2x Bw slash</a></pre><br><pre>\n<a href="file://">file</a> =><a href="file://">file</a></pre>