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<?php preg_match("/([user1])[user2][user3][user4][user5]/", "user1user2user3user4user5", $matches); echo "<pre>"; print_r($matches); echo "</pre>";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/4Pp60
function name:  (null)
number of ops:  11
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2F%28%5Buser1%5D%29%5Buser2%5D%5Buser3%5D%5Buser4%5D%5Buser5%5D%2F'
          2        SEND_VAL                                                 'user1user2user3user4user5'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                                 
    3     5        ECHO                                                     '%3Cpre%3E'
    4     6        INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
    5     9        ECHO                                                     '%3C%2Fpre%3E'
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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