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

Generated using Vulcan Logic Dumper, using php 8.0.0


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