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<?php preg_match_all('~(?<=\K..).~', '123456', $m); print_r($m[0]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FqOlR
function name:  (null)
number of ops:  10
compiled vars:  !0 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_match_all'
          1        SEND_VAL                                                 '%7E%28%3F%3C%3D%5CK..%29.%7E'
          2        SEND_VAL                                                 '123456'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                                 
    4     5        INIT_FCALL                                               'print_r'
          6        FETCH_DIM_R                                      ~2      !0, 0
          7        SEND_VAL                                                 ~2
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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