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<?php if (preg_match('~^(?(?=\d+$)\d{1,5}|.*)$~', "1234")) { echo 'Match found.'; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 5, Position 2 = 6
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
filename:       /in/ZQVXb
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%7E%5E%28%3F%28%3F%3D%5Cd%2B%24%29%5Cd%7B1%2C5%7D%7C.%2A%29%24%7E'
          2        SEND_VAL                                                 '1234'
          3        DO_ICALL                                         $0      
          4      > JMPZ                                                     $0, ->6
    4     5    >   ECHO                                                     'Match+found.'
    5     6    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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