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<?php $result = preg_replace('#\[(right)\](((?R)|[^[]+?|\[)*)\[/\\1\]#siU', '', $text); var_dump($text); var_dump($result);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/O1tkn
function name:  (null)
number of ops:  13
compiled vars:  !0 = $result, !1 = $text
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%23%5C%5B%28right%29%5C%5D%28%28%28%3FR%29%7C%5B%5E%5B%5D%2B%3F%7C%5C%5B%29%2A%29%5C%5B%2F%5C1%5C%5D%23siU'
          2        SEND_VAL                                                 ''
          3        SEND_VAR                                                 !1
          4        DO_ICALL                                         $2      
          5        ASSIGN                                                   !0, $2
    3     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
    4     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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