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<?php $str = '123.23.23.4/17,'; $str .= '123.23.23.4/23,'; $str .= '123.23.23.4/8,'; $str .= '123.23.23.4/18'; preg_match_all("~/\K(?:[1-9]|[12][0-9]|3[01])\b~", $str, $matches); print_r($matches[0]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 17 [1] => 23 [2] => 8 [3] => 18 )

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