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<?php echo preg_replace('/#(\S{1,24}+)/u', '<$0>', 'sdfsdf sdfsdf d&#блабла fdfdfdf').PHP_EOL;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/c2ubu
function name:  (null)
number of ops:  8
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%2F%23%28%5CS%7B1%2C24%7D%2B%29%2Fu'
          2        SEND_VAL                                                 '%3C%240%3E'
          3        SEND_VAL                                                 'sdfsdf+sdfsdf+d%26%23%D0%B1%D0%BB%D0%B0%D0%B1%D0%BB%D0%B0+fdfdfdf'
          4        DO_ICALL                                         $0      
          5        CONCAT                                           ~1      $0, '%0A'
          6        ECHO                                                     ~1
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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