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<?php $re = '/^(?\'a\'1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.(?&a)$/m'; $str = '255.255'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HUICY
function name:  (null)
number of ops:  13
compiled vars:  !0 = $re, !1 = $str, !2 = $matches
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%2F%5E%28%3F%27a%271%3F%5B0-9%5D%3F%5B0-9%5D%7C2%5B0-4%5D%5B0-9%5D%7C25%5B0-5%5D%29%5C.%28%3F%26a%29%24%2Fm'
    4     1        ASSIGN                                                       !1, '255.255'
    6     2        INIT_FCALL                                                   'preg_match_all'
          3        SEND_VAR                                                     !0
          4        SEND_VAR                                                     !1
          5        SEND_REF                                                     !2
          6        SEND_VAL                                                     2
          7        SEND_VAL                                                     0
          8        DO_ICALL                                                     
    9     9        INIT_FCALL                                                   'var_dump'
         10        SEND_VAR                                                     !2
         11        DO_ICALL                                                     
         12      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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