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<?php $regex = '/foo(bar(*SKIP)(*FAIL)|.*)$/'; var_dump(preg_match($regex, 'foobar')); var_dump(preg_match($regex, 'foobat')); var_dump(preg_match($regex, 'foogbar'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/AVTOU
function name:  (null)
number of ops:  23
compiled vars:  !0 = $regex
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2Ffoo%28bar%28%2ASKIP%29%28%2AFAIL%29%7C.%2A%29%24%2F'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 'foobar'
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
    6     8        INIT_FCALL                                               'var_dump'
          9        INIT_FCALL                                               'preg_match'
         10        SEND_VAR                                                 !0
         11        SEND_VAL                                                 'foobat'
         12        DO_ICALL                                         $4      
         13        SEND_VAR                                                 $4
         14        DO_ICALL                                                 
    7    15        INIT_FCALL                                               'var_dump'
         16        INIT_FCALL                                               'preg_match'
         17        SEND_VAR                                                 !0
         18        SEND_VAL                                                 'foogbar'
         19        DO_ICALL                                         $6      
         20        SEND_VAR                                                 $6
         21        DO_ICALL                                                 
         22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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