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<?php $str = 'e |a\\|b\\\\|c\\\\\\|d\\'; preg_match_all('/(?:[^\x5c\|]|\x5c(?:.|$))+/', $str, $matches); var_dump($str, $matches[0]); $result = preg_split('/(?<!\x5c)(?:\x5c.)*\K\|/s', $str); var_dump($result);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bJED0
function name:  (null)
number of ops:  20
compiled vars:  !0 = $str, !1 = $matches, !2 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'e+%7Ca%5C%7Cb%5C%5C%7Cc%5C%5C%5C%7Cd%5C'
    3     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%2F%28%3F%3A%5B%5E%5Cx5c%5C%7C%5D%7C%5Cx5c%28%3F%3A.%7C%24%29%29%2B%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !0
          8        FETCH_DIM_R                                      ~5      !1, 0
          9        SEND_VAL                                                 ~5
         10        DO_ICALL                                                 
    6    11        INIT_FCALL                                               'preg_split'
         12        SEND_VAL                                                 '%2F%28%3F%3C%21%5Cx5c%29%28%3F%3A%5Cx5c.%29%2A%5CK%5C%7C%2Fs'
         13        SEND_VAR                                                 !0
         14        DO_ICALL                                         $7      
         15        ASSIGN                                                   !2, $7
    8    16        INIT_FCALL                                               'var_dump'
         17        SEND_VAR                                                 !2
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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