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<?php $string = '<b>AAAAA</b>'; var_dump( preg_replace('^<(*)>(*)<(*)$)', '*') );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5d7PG
function name:  (null)
number of ops:  9
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3Cb%3EAAAAA%3C%2Fb%3E'
    3     1        INIT_FCALL                                               'var_dump'
    4     2        INIT_FCALL                                               'preg_replace'
          3        SEND_VAL                                                 '%5E%3C%28%2A%29%3E%28%2A%29%3C%28%2A%29%24%29'
          4        SEND_VAL                                                 '%2A'
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
    5     8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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