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<?php preg_match( '#^AH\d{6}$#', AH587910); echo $matches[1]; // 1234
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VkC7S
function name:  (null)
number of ops:  8
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%23%5EAH%5Cd%7B6%7D%24%23'
          2        FETCH_CONSTANT                                   ~1      'AH587910'
          3        SEND_VAL                                                 ~1
          4        DO_ICALL                                                 
    3     5        FETCH_DIM_R                                      ~3      !0, 1
          6        ECHO                                                     ~3
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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