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<?php $s = "Re: Re: Re: Re: Re: Re: Re: Re: Prueba"; $s =preg_replace("/(Re: ?){2,}/i", "Re: ", $s); var_dump($s);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fgtAe
function name:  (null)
number of ops:  11
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'Re%3A+Re%3A+Re%3A+Re%3A+Re%3A+Re%3A+Re%3A+Re%3A+Prueba'
    3     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28Re%3A+%3F%29%7B2%2C%7D%2Fi'
          3        SEND_VAL                                                 'Re%3A+'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ASSIGN                                                   !0, $2
    4     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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