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<?php $string = ":èñïîëüçîâàíûäàííûåx_fields.txt;èñïîëü"; preg_match_all("/[\p{N}\p{L}]+/iu", $string, $splitTokens); var_dump($splitTokens);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lovoe
function name:  (null)
number of ops:  10
compiled vars:  !0 = $string, !1 = $splitTokens
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3A%C3%A8%C3%B1%C3%AF%C3%AE%C3%AB%C3%BC%C3%A7%C3%AE%C3%A2%C3%A0%C3%AD%C3%BB%C3%A4%C3%A0%C3%AD%C3%AD%C3%BB%C3%A5x_fields.txt%3B%C3%A8%C3%B1%C3%AF%C3%AE%C3%AB%C3%BC'
    3     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%2F%5B%5Cp%7BN%7D%5Cp%7BL%7D%5D%2B%2Fiu'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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154.5 ms | 1394 KiB | 17 Q