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<?php function clean($string) { return preg_replace('/[^A-Za-z0-9.\/\-_~]/', '', $string); } function clean2($string) { return preg_replace('#\p{C}+|^\./#u', '', $string); } $toClean = ' abcDEF123./-_~àéèùïî% *\@& '; var_dump(clean($toClean)); var_dump(clean2($toClean));
Output for git.master, git.master_jit, rfc.property-hooks
string(14) "abcDEF123./-_~" string(34) " abcDEF123./-_~àéèùïî% *\@& "

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