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<?php var_dump(preg_replace('~(?<!^ {0,50}) //~', '-', ' // x // y'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qoEooV
function name:  (null)
number of ops:  9
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%28%3F%3C%21%5E+%7B0%2C50%7D%29++%2F%2F%7E'
          3        SEND_VAL                                                 '-'
          4        SEND_VAL                                                 '+++%2F%2F+x+++%2F%2F+y'
          5        DO_ICALL                                         $0      
          6        SEND_VAR                                                 $0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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