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<?php echo preg_match('!!u', "سلام");
based on OhmuM
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/KfjjS
function name:  (null)
number of ops:  6
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'preg_match'
         1        SEND_VAL                                                 '%21%21u'
         2        SEND_VAL                                                 '%D8%B3%D9%84%D8%A7%D9%85'
         3        DO_ICALL                                         $0      
         4        ECHO                                                     $0
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0