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<?php $etag = "123-456\"789"; $regex = '~(?:^|[\h,]+)(?:W/)?(")?(?(1)((?:[^"\\\\]|\\\\.)*(*MARK:Q))(?:"|\\\\|$)|([^,]*(*MARK:T)))~'; \preg_match_all($regex, $etag, $matches, \PREG_SET_ORDER); print_r($matches); var_dump(strpos('123\'123', '\\'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/BjOIS
function name:  (null)
number of ops:  19
compiled vars:  !0 = $etag, !1 = $regex, !2 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '123-456%22789'
    5     1        ASSIGN                                                   !1, '%7E%28%3F%3A%5E%7C%5B%5Ch%2C%5D%2B%29%28%3F%3AW%2F%29%3F%28%22%29%3F%28%3F%281%29%28%28%3F%3A%5B%5E%22%5C%5C%5D%7C%5C%5C.%29%2A%28%2AMARK%3AQ%29%29%28%3F%3A%22%7C%5C%5C%7C%24%29%7C%28%5B%5E%2C%5D%2A%28%2AMARK%3AT%29%29%29%7E'
    7     2        INIT_FCALL                                               'preg_match_all'
          3        SEND_VAR                                                 !1
          4        SEND_VAR                                                 !0
          5        SEND_REF                                                 !2
          6        SEND_VAL                                                 2
          7        DO_ICALL                                                 
    9     8        INIT_FCALL                                               'print_r'
          9        SEND_VAR                                                 !2
         10        DO_ICALL                                                 
   11    11        INIT_FCALL                                               'var_dump'
         12        INIT_FCALL                                               'strpos'
         13        SEND_VAL                                                 '123%27123'
         14        SEND_VAL                                                 '%5C'
         15        DO_ICALL                                         $7      
         16        SEND_VAR                                                 $7
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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