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<?php $pattern = '/^[a-z]{5,8}_(\d{1,2})\.jpg$/'; $names = [ 'asd_1234.jpg', 'asdfg_12.jpg', 'asdfgj_72.jpg', 'as123_1.jpg', 'asdfg_.jpg', 'qweasdfgj_24.jpg', ]; foreach ($names as $entry) { if (preg_match($pattern, $entry, $matches)) { echo "{$entry}: ${matches[1]}\n"; } else { echo "{$entry} doesn't match\n"; } }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 21
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 21
Branch analysis from position: 4
2 jumps found. (Code = 43) Position 1 = 10, Position 2 = 17
Branch analysis from position: 10
1 jumps found. (Code = 42) Position 1 = 20
Branch analysis from position: 20
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 17
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 21
filename:       /in/tg8CA
function name:  (null)
number of ops:  23
compiled vars:  !0 = $pattern, !1 = $names, !2 = $entry, !3 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2F%5E%5Ba-z%5D%7B5%2C8%7D_%28%5Cd%7B1%2C2%7D%29%5C.jpg%24%2F'
    4     1        ASSIGN                                                   !1, <array>
   13     2      > FE_RESET_R                                       $6      !1, ->21
          3    > > FE_FETCH_R                                               $6, !2, ->21
   14     4    >   INIT_FCALL                                               'preg_match'
          5        SEND_VAR                                                 !0
          6        SEND_VAR                                                 !2
          7        SEND_REF                                                 !3
          8        DO_ICALL                                         $7      
          9      > JMPZ                                                     $7, ->17
   15    10    >   ROPE_INIT                                     4  ~10     !2
         11        ROPE_ADD                                      1  ~10     ~10, '%3A+'
         12        FETCH_DIM_R                                      ~8      !3, 1
         13        ROPE_ADD                                      2  ~10     ~10, ~8
         14        ROPE_END                                      3  ~9      ~10, '%0A'
         15        ECHO                                                     ~9
   14    16      > JMP                                                      ->20
   17    17    >   NOP                                                      
         18        FAST_CONCAT                                      ~12     !2, '+doesn%27t+match%0A'
         19        ECHO                                                     ~12
   13    20    > > JMP                                                      ->3
         21    >   FE_FREE                                                  $6
   19    22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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