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run code in 200+ php & hhvm versions
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<?php $rr='input name=&quot;LFMIdsite&quot; value=&quot;5678&quot;'; echo preg_replace('name=&quot;LFMIdsite&quot; value=&quot;(.*?)&quot;', 'name=&quot;LFMIdsite&quot; value=&quot;500&quot;', $rr); ?>
Output for 4.3.11 - 7.1.7
Warning: preg_replace(): Delimiter must not be alphanumeric or backslash in /in/cSZWO on line 3
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/cSZWO on line 3