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<?php $ret_str = "online shell "; echo strtolower(preg_replace("/[^A-Za-z0-9_]/", '', str_replace(' ', '_', trim($ret_str)))); $ret_str = preg_replace("/[^A-Za-z0-9_]/", '', $ret_str); $ret_str = preg_replace("/[_]+/", '_', $ret_str); echo "\n".$ret_str;
Output for git.master, git.master_jit, rfc.property-hooks
online_shell onlineshell

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