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run code in 200+ php & hhvm versions
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<?php $pre ="<a href=\""; $post= "</a>"; $in = ['http://">http', 'ftp://">ftp', 'mailto://">mailto', '#">HASH', '//">2xfw slash', '\\\\">2x Bw slash', 'file://">file' ]; $replacements = ['/((?:href|src) *= *[\'"](?!(http|ftp|mailto|file|javascript|#|[a-z]+:|'. preg_quote('\\\\',"/"). '|\/\/)))(\/?)/i' => "$1" . "xxxxABSOLUTE/PATH/" ]; foreach($in as $test) { echo '<pre>\n'; $r = $pre . $test . $post; echo "$r =>" . preg_replace(array_keys($replacements), $replacements, $r); echo '</pre>'; }
based on 0uNtH
Output for 5.4.0 - 7.2.0
<pre>\n<a href="http://">http</a> =><a href="http://">http</a></pre><pre>\n<a href="ftp://">ftp</a> =><a href="ftp://">ftp</a></pre><pre>\n<a href="mailto://">mailto</a> =><a href="mailto://">mailto</a></pre><pre>\n<a href="#">HASH</a> =><a href="#">HASH</a></pre><pre>\n<a href="//">2xfw slash</a> =><a href="//">2xfw slash</a></pre><pre>\n<a href="\\">2x Bw slash</a> =><a href="\\">2x Bw slash</a></pre><pre>\n<a href="file://">file</a> =><a href="file://">file</a></pre>
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ci9ak on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/ci9ak on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/ci9ak on line 4
Process exited with code 255.