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<?php echo preg_match('/^([1-9]{1}[0-9]{3} ?[A-Z]{2})|([1-9]{1}[0-9]{3})$/', 123456789123456789, $matches); print_r($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CXjSh
function name:  (null)
number of ops:  10
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2F%5E%28%5B1-9%5D%7B1%7D%5B0-9%5D%7B3%7D+%3F%5BA-Z%5D%7B2%7D%29%7C%28%5B1-9%5D%7B1%7D%5B0-9%5D%7B3%7D%29%24%2F'
          2        SEND_VAL                                                 123456789123456789
          3        SEND_REF                                                 !0
          4        DO_ICALL                                         $1      
          5        ECHO                                                     $1
    5     6        INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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