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<?php $txt="Неё, неё в этом дело. Но удержать такого запала, правда?"; var_dump(preg_match_all("~(?<![\p{L}\p{Nd}])не(?![\p{L}\p{Nd}])~iu", $txt, $out)); var_dump( $out );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UFH8D
function name:  (null)
number of ops:  13
compiled vars:  !0 = $txt, !1 = $out
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%D0%9D%D0%B5%D1%91%2C+%D0%BD%D0%B5%D1%91+%D0%B2+%D1%8D%D1%82%D0%BE%D0%BC+%D0%B4%D0%B5%D0%BB%D0%BE.+%D0%9D%D0%BE+%D1%83%D0%B4%D0%B5%D1%80%D0%B6%D0%B0%D1%82%D1%8C+%D1%82%D0%B0%D0%BA%D0%BE%D0%B3%D0%BE+%D0%B7%D0%B0%D0%BF%D0%B0%D0%BB%D0%B0%2C+%D0%BF%D1%80%D0%B0%D0%B2%D0%B4%D0%B0%3F'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match_all'
          3        SEND_VAL                                                 '%7E%28%3F%3C%21%5B%5Cp%7BL%7D%5Cp%7BNd%7D%5D%29%D0%BD%D0%B5%28%3F%21%5B%5Cp%7BL%7D%5Cp%7BNd%7D%5D%29%7Eiu'
          4        SEND_VAR                                                 !0
          5        SEND_REF                                                 !1
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !1
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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