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<?php function x($value, $pattern) { $v1 = preg_match("\x01^($pattern)\\z\x01u", $value); echo "1) $value = " . ($v1 ? "A":"N") . "\n"; $v2 = preg_match("#($pattern)#", $value); echo "2) $value = " . ($v2 ? "A":"N") . "\n"; echo $v1 != $v2 ? "!!! mismatch\n---\n" : "----\n"; } x("xaaax", '(.)\1{2,}'); x("xaaax", '(.)\2{2,}'); x("xaaax", '(?:(.)\1{2,})'); x("xaaax", '(?:(.)\2{2,})');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/3BUJe
function name:  (null)
number of ops:  17
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   INIT_FCALL                                               'x'
          1        SEND_VAL                                                 'xaaax'
          2        SEND_VAL                                                 '%28.%29%5C1%7B2%2C%7D'
          3        DO_FCALL                                      0          
   16     4        INIT_FCALL                                               'x'
          5        SEND_VAL                                                 'xaaax'
          6        SEND_VAL                                                 '%28.%29%5C2%7B2%2C%7D'
          7        DO_FCALL                                      0          
   18     8        INIT_FCALL                                               'x'
          9        SEND_VAL                                                 'xaaax'
         10        SEND_VAL                                                 '%28%3F%3A%28.%29%5C1%7B2%2C%7D%29'
         11        DO_FCALL                                      0          
   20    12        INIT_FCALL                                               'x'
         13        SEND_VAL                                                 'xaaax'
         14        SEND_VAL                                                 '%28%3F%3A%28.%29%5C2%7B2%2C%7D%29'
         15        DO_FCALL                                      0          
         16      > RETURN                                                   1

Function x:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 14, Position 2 = 16
Branch analysis from position: 14
1 jumps found. (Code = 42) Position 1 = 17
Branch analysis from position: 17
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 34
Branch analysis from position: 32
1 jumps found. (Code = 42) Position 1 = 35
Branch analysis from position: 35
2 jumps found. (Code = 43) Position 1 = 40, Position 2 = 42
Branch analysis from position: 40
1 jumps found. (Code = 42) Position 1 = 43
Branch analysis from position: 43
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 42
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 34
2 jumps found. (Code = 43) Position 1 = 40, Position 2 = 42
Branch analysis from position: 40
Branch analysis from position: 42
Branch analysis from position: 16
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 34
Branch analysis from position: 32
Branch analysis from position: 34
filename:       /in/3BUJe
function name:  x
number of ops:  45
compiled vars:  !0 = $value, !1 = $pattern, !2 = $v1, !3 = $v2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    4     2        INIT_FCALL                                               'preg_match'
          3        ROPE_INIT                                     3  ~5      '%01%5E%28'
          4        ROPE_ADD                                      1  ~5      ~5, !1
          5        ROPE_END                                      2  ~4      ~5, '%29%5Cz%01u'
          6        SEND_VAL                                                 ~4
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                         $7      
          9        ASSIGN                                                   !2, $7
    5    10        ROPE_INIT                                     3  ~10     '1%29+'
         11        ROPE_ADD                                      1  ~10     ~10, !0
         12        ROPE_END                                      2  ~9      ~10, '+%3D+'
         13      > JMPZ                                                     !2, ->16
         14    >   QM_ASSIGN                                        ~12     'A'
         15      > JMP                                                      ->17
         16    >   QM_ASSIGN                                        ~12     'N'
         17    >   CONCAT                                           ~13     ~9, ~12
         18        CONCAT                                           ~14     ~13, '%0A'
         19        ECHO                                                     ~14
    7    20        INIT_FCALL                                               'preg_match'
         21        ROPE_INIT                                     3  ~16     '%23%28'
         22        ROPE_ADD                                      1  ~16     ~16, !1
         23        ROPE_END                                      2  ~15     ~16, '%29%23'
         24        SEND_VAL                                                 ~15
         25        SEND_VAR                                                 !0
         26        DO_ICALL                                         $18     
         27        ASSIGN                                                   !3, $18
    8    28        ROPE_INIT                                     3  ~21     '2%29+'
         29        ROPE_ADD                                      1  ~21     ~21, !0
         30        ROPE_END                                      2  ~20     ~21, '+%3D+'
         31      > JMPZ                                                     !3, ->34
         32    >   QM_ASSIGN                                        ~23     'A'
         33      > JMP                                                      ->35
         34    >   QM_ASSIGN                                        ~23     'N'
         35    >   CONCAT                                           ~24     ~20, ~23
         36        CONCAT                                           ~25     ~24, '%0A'
         37        ECHO                                                     ~25
   10    38        IS_NOT_EQUAL                                             !2, !3
         39      > JMPZ                                                     ~26, ->42
         40    >   QM_ASSIGN                                        ~27     '%21%21%21+mismatch%0A---%0A'
         41      > JMP                                                      ->43
         42    >   QM_ASSIGN                                        ~27     '----%0A'
         43    >   ECHO                                                     ~27
   12    44      > RETURN                                                   null

End of function x

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