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<?php $str = '(a,b),a,b,c,(a,f)'; $str = preg_replace_callback('`("|\').*?\1`', function ($matches) { return preg_replace('`(?<!\\\)[()]`', '\\\;', $matches[0]); }, $str); echo $str;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hun5l
function name:  (null)
number of ops:  10
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%28a%2Cb%29%2Ca%2Cb%2Cc%2C%28a%2Cf%29'
    4     1        INIT_FCALL                                               'preg_replace_callback'
          2        SEND_VAL                                                 '%60%28%22%7C%27%29.%2A%3F%5C1%60'
          3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2Fhun5l%3A4%240'
    6     4        SEND_VAL                                                 ~2
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $3      
    4     7        ASSIGN                                                   !0, $3
    8     8        ECHO                                                     !0
          9      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2Fhun5l%3A4%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hun5l
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
    5     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%60%28%3F%3C%21%5C%5C%29%5B%28%29%5D%60'
          3        SEND_VAL                                                 '%5C%5C%3B'
          4        FETCH_DIM_R                                      ~1      !0, 0
          5        SEND_VAL                                                 ~1
          6        DO_ICALL                                         $2      
          7      > RETURN                                                   $2
    6     8*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2Fhun5l%3A4%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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