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<?php var_dump(preg_match('/[あシ]/', 'ぷ'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/s1CSd
function name:  (null)
number of ops:  5
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                                   'var_dump'
          1        FRAMELESS_ICALL_2                preg_match          ~0      '%2F%5B%E3%81%82%E3%82%B7%5D%2F', '%E3%81%B7'
          2        SEND_VAL                                                     ~0
          3        DO_ICALL                                                     
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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