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<?php if ( preg_match("%^(\w+)?$%", "",$matches) ) { print_r($matches); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 9
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
filename:       /in/EZXQt
function name:  (null)
number of ops:  10
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%25%5E%28%5Cw%2B%29%3F%24%25'
          2        SEND_VAL                                                 ''
          3        SEND_REF                                                 !0
          4        DO_ICALL                                         $1      
          5      > JMPZ                                                     $1, ->9
    4     6    >   INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
    5     9    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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