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<?php $username_pattern = '/^(?!\d*$)[a-z0-9]{8,20}$/'; $userNames = [ "1a3b5678", "1a3b5678abcd", "12345678", "1a3b5678abcddddddddddddddddddddddddddddddd", "1a3B5678", "a1" ]; foreach ($userNames as $userName) { if (preg_match($username_pattern, $userName)) { echo "Match - $userName" . PHP_EOL; } else { echo "No match - $userName" . PHP_EOL; } }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 19
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 19
Branch analysis from position: 4
2 jumps found. (Code = 43) Position 1 = 9, Position 2 = 14
Branch analysis from position: 9
1 jumps found. (Code = 42) Position 1 = 18
Branch analysis from position: 18
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 14
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 19
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 19
filename:       /in/7em2P
function name:  (null)
number of ops:  21
compiled vars:  !0 = $username_pattern, !1 = $userNames, !2 = $userName
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2F%5E%28%3F%21%5Cd%2A%24%29%5Ba-z0-9%5D%7B8%2C20%7D%24%2F'
    4     1        ASSIGN                                                   !1, <array>
   13     2      > FE_RESET_R                                       $5      !1, ->19
          3    > > FE_FETCH_R                                               $5, !2, ->19
   14     4    >   INIT_FCALL                                               'preg_match'
          5        SEND_VAR                                                 !0
          6        SEND_VAR                                                 !2
          7        DO_ICALL                                         $6      
          8      > JMPZ                                                     $6, ->14
   15     9    >   NOP                                                      
         10        FAST_CONCAT                                      ~7      'Match+-+', !2
         11        CONCAT                                           ~8      ~7, '%0A'
         12        ECHO                                                     ~8
         13      > JMP                                                      ->18
   17    14    >   NOP                                                      
         15        FAST_CONCAT                                      ~9      'No+match+-+', !2
         16        CONCAT                                           ~10     ~9, '%0A'
         17        ECHO                                                     ~10
   13    18    > > JMP                                                      ->3
         19    >   FE_FREE                                                  $5
   19    20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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