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<?php $string = '(2+3-4*2(1+1-2)+(2+2)-3+4+2-5*4+2*(1+1))+2+(1+1)'; preg_match_all('@\( ( ( (?>[^()]+) | (?R) )* ) \)@x',$string,$matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(2) { [0]=> string(40) "(2+3-4*2(1+1-2)+(2+2)-3+4+2-5*4+2*(1+1))" [1]=> string(5) "(1+1)" } [1]=> array(2) { [0]=> string(38) "2+3-4*2(1+1-2)+(2+2)-3+4+2-5*4+2*(1+1)" [1]=> string(3) "1+1" } [2]=> array(2) { [0]=> string(5) "(1+1)" [1]=> string(3) "1+1" } }

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