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<?php $string = '=iferror(ifs(OR("foo", "bar"),"a",OR("tar", OR("scar", "baa")),"b",OR("lar"),"d"),"c") blah blah ifs(OR("foo", "bar"),"a") and another one ifs("a", OR("tar", OR("scar", "baa")),"b",OR("lar"),"d")'; $regex = '/ifs(\(((?>[^()]+)|(?-2))*\))/'; preg_match_all($regex, $string, $matches); print_r($matches[0]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => ifs(OR("foo", "bar"),"a",OR("tar", OR("scar", "baa")),"b",OR("lar"),"d") [1] => ifs(OR("foo", "bar"),"a") [2] => ifs("a", OR("tar", OR("scar", "baa")),"b",OR("lar"),"d") )

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