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<?php $string = "23 asdasdasdasd.sma(33) asda sdas asd 23 2 3 54232 23d asd"; $reg = '/\(\K\d+(?=\))/'; preg_match($reg, $string, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(2) "33" }

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