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<?php $str = "required|equals[1|2|3|4|5]|trim"; preg_match_all('/[^\[\|]+(?:\[.+?\])?/', $str, $matches); print_r($matches[0]); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RXGPp
function name:  (null)
number of ops:  11
compiled vars:  !0 = $str, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'required%7Cequals%5B1%7C2%7C3%7C4%7C5%5D%7Ctrim'
    5     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%2F%5B%5E%5C%5B%5C%7C%5D%2B%28%3F%3A%5C%5B.%2B%3F%5C%5D%29%3F%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    7     6        INIT_FCALL                                               'print_r'
          7        FETCH_DIM_R                                      ~4      !1, 0
          8        SEND_VAL                                                 ~4
          9        DO_ICALL                                                 
    8    10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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