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<?php $kw = " asdsdfsdf \0 as "; var_export(preg_match('/./u', $kw));
based on TvnXW
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/TEHmN
function name:  (null)
number of ops:  9
compiled vars:  !0 = $kw
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, '+asdsdfsdf++%00+as+'
   3     1        INIT_FCALL                                               'var_export'
         2        INIT_FCALL                                               'preg_match'
         3        SEND_VAL                                                 '%2F.%2Fu'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                         $2      
         6        SEND_VAR                                                 $2
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0