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<?php var_dump(preg_match('/.*/', hex2bin('ff'))); var_dump(preg_match('/^$/', hex2bin('ff'))); var_dump(preg_match('/.*/u', hex2bin('ff'))); var_dump(preg_grep('/.*/u', [hex2bin('ff')]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kihD6
function name:  (null)
number of ops:  42
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F.%2A%2F'
          3        INIT_FCALL                                               'hex2bin'
          4        SEND_VAL                                                 'ff'
          5        DO_ICALL                                         $0      
          6        SEND_VAR                                                 $0
          7        DO_ICALL                                         $1      
          8        SEND_VAR                                                 $1
          9        DO_ICALL                                                 
    4    10        INIT_FCALL                                               'var_dump'
         11        INIT_FCALL                                               'preg_match'
         12        SEND_VAL                                                 '%2F%5E%24%2F'
         13        INIT_FCALL                                               'hex2bin'
         14        SEND_VAL                                                 'ff'
         15        DO_ICALL                                         $3      
         16        SEND_VAR                                                 $3
         17        DO_ICALL                                         $4      
         18        SEND_VAR                                                 $4
         19        DO_ICALL                                                 
    5    20        INIT_FCALL                                               'var_dump'
         21        INIT_FCALL                                               'preg_match'
         22        SEND_VAL                                                 '%2F.%2A%2Fu'
         23        INIT_FCALL                                               'hex2bin'
         24        SEND_VAL                                                 'ff'
         25        DO_ICALL                                         $6      
         26        SEND_VAR                                                 $6
         27        DO_ICALL                                         $7      
         28        SEND_VAR                                                 $7
         29        DO_ICALL                                                 
    6    30        INIT_FCALL                                               'var_dump'
         31        INIT_FCALL                                               'preg_grep'
         32        SEND_VAL                                                 '%2F.%2A%2Fu'
         33        INIT_FCALL                                               'hex2bin'
         34        SEND_VAL                                                 'ff'
         35        DO_ICALL                                         $9      
         36        INIT_ARRAY                                       ~10     $9
         37        SEND_VAL                                                 ~10
         38        DO_ICALL                                         $11     
         39        SEND_VAR                                                 $11
         40        DO_ICALL                                                 
         41      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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