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<?php mb_internal_encoding('UTF-8'); mb_regex_encoding('UTF-8'); var_dump(mb_eregi('Ü','ü')); var_dump(mb_ereg("[Ü]","ü"));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/I4Ksj
function name:  (null)
number of ops:  21
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'mb_internal_encoding'
         1        SEND_VAL                                                 'UTF-8'
         2        DO_ICALL                                                 
   4     3        INIT_FCALL                                               'mb_regex_encoding'
         4        SEND_VAL                                                 'UTF-8'
         5        DO_ICALL                                                 
   6     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'mb_eregi'
         8        SEND_VAL                                                 '%C3%9C'
         9        SEND_VAL                                                 '%C3%BC'
        10        DO_ICALL                                         $2      
        11        SEND_VAR                                                 $2
        12        DO_ICALL                                                 
   7    13        INIT_FCALL                                               'var_dump'
        14        INIT_FCALL                                               'mb_ereg'
        15        SEND_VAL                                                 '%5B%C3%9C%5D'
        16        SEND_VAL                                                 '%C3%BC'
        17        DO_ICALL                                         $4      
        18        SEND_VAR                                                 $4
        19        DO_ICALL                                                 
        20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0