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<?php $strings = [ 'attachment;filename="unnamed.jpg";filename*=UTF-8\'\'unnamed.jpg\'', 'attachment;filename="unnamed.jpg"', 'attachment;filename=unnamed.jpg;filename*=UTF-8\'\'unnamed.jpg\'', 'attachment;filename=unnamed.jpg' ]; foreach ($strings as $string) { preg_match('/^.*?filename="?\K[^";]+/m', $string, $matches); print_r($matches); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 12
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 12
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 12
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 12
filename:       /in/UkX38
function name:  (null)
number of ops:  14
compiled vars:  !0 = $strings, !1 = $string, !2 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   10     1      > FE_RESET_R                                       $4      !0, ->12
          2    > > FE_FETCH_R                                               $4, !1, ->12
   11     3    >   INIT_FCALL                                               'preg_match'
          4        SEND_VAL                                                 '%2F%5E.%2A%3Ffilename%3D%22%3F%5CK%5B%5E%22%3B%5D%2B%2Fm'
          5        SEND_VAR                                                 !1
          6        SEND_REF                                                 !2
          7        DO_ICALL                                                 
   12     8        INIT_FCALL                                               'print_r'
          9        SEND_VAR                                                 !2
         10        DO_ICALL                                                 
   10    11      > JMP                                                      ->2
         12    >   FE_FREE                                                  $4
   13    13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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