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<?php preg_match_all('#\w#u','işşişillıu',$f); var_dump($f); preg_match_all('#\pL#u','سیب',$f); var_dump($f);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FopR7
function name:  (null)
number of ops:  17
compiled vars:  !0 = $f
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_match_all'
          1        SEND_VAL                                                 '%23%5Cw%23u'
          2        SEND_VAL                                                 'i%C5%9F%C5%9Fi%C5%9Fill%C4%B1u'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                                 
    3     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
    5     8        INIT_FCALL                                               'preg_match_all'
          9        SEND_VAL                                                 '%23%5CpL%23u'
         10        SEND_VAL                                                 '%D8%B3%DB%8C%D8%A8'
         11        SEND_REF                                                 !0
         12        DO_ICALL                                                 
    6    13        INIT_FCALL                                               'var_dump'
         14        SEND_VAR                                                 !0
         15        DO_ICALL                                                 
         16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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