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run code in 200+ php & hhvm versions
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<?php $str = '\\\x40'; $strip_hex = '';//'#[\\\]+#i'; $clean = preg_replace($strip_hex,'',$str); echo $clean;
based on jKsBv
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Empty regular expression in /in/M957t on line 5
Output for 4.3.0 - 4.3.10
Warning: Empty regular expression in /in/M957t on line 5