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<?php $string = '(ab(cd)ef))'; preg_match_all('@\( ( ( (?>[^()]+) | (?R) )* ) \)@x',$string,$matches); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/E4Zu2
function name:  (null)
number of ops:  10
compiled vars:  !0 = $string, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%28ab%28cd%29ef%29%29'
    3     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%40%5C%28+%28+%28+%28%3F%3E%5B%5E%28%29%5D%2B%29+%7C+%28%3FR%29+%29%2A+%29+%5C%29%40x'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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