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<?php $strings = [ "(a+b)", "(a+b)(ab+ba)", "(a+b)(ab+ba)(ab+ba)", "(ab+ba)", "a+b", " (a+b)(, (a+b)a" ]; $pattern = '/^\(a\+b\)(?:\(ab\+ba\))*$/'; foreach ($strings as $string) { preg_match($pattern, $string, $matches); print_r($matches); }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => (a+b) ) Array ( [0] => (a+b)(ab+ba) ) Array ( [0] => (a+b)(ab+ba)(ab+ba) ) Array ( ) Array ( ) Array ( )

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