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run code in 200+ php & hhvm versions
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<?php $str = "/asdfasdf/asdfasdf/asdfasdf/asdf.flv"; echo preg_replace("\/[^\/]", "posters/$0", $str);
Output for 4.3.11 - 7.1.7
Warning: preg_replace(): Delimiter must not be alphanumeric or backslash in /in/5AgJV on line 5
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/5AgJV on line 5