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<?php $value = 'ryan_test3.10.239.252.211'; var_dump(preg_match('/(?=^.{4,253}$)(^((?!-)[a-z0-9-_]{1,63}(?<!-)\.)*?((?!-)[a-z0-9-]{1,63}(?<!-)\.)[a-z]{2,63}\.?$)/i', $value));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rcC3J
function name:  (null)
number of ops:  9
compiled vars:  !0 = $value
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'ryan_test3.10.239.252.211'
    4     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%2F%28%3F%3D%5E.%7B4%2C253%7D%24%29%28%5E%28%28%3F%21-%29%5Ba-z0-9-_%5D%7B1%2C63%7D%28%3F%3C%21-%29%5C.%29%2A%3F%28%28%3F%21-%29%5Ba-z0-9-%5D%7B1%2C63%7D%28%3F%3C%21-%29%5C.%29%5Ba-z%5D%7B2%2C63%7D%5C.%3F%24%29%2Fi'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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