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<?php var_dump(preg_replace('{^(\\\\?(?:[^\\\\]+\\\\?)+)[^\\\\]+$}', '$1', 'Grapa\\Cli\\Db'));
based on GlK3G
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6ZTsp
function name:  (null)
number of ops:  9
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'preg_replace'
         2        SEND_VAL                                                 '%7B%5E%28%5C%5C%3F%28%3F%3A%5B%5E%5C%5C%5D%2B%5C%5C%3F%29%2B%29%5B%5E%5C%5C%5D%2B%24%7D'
         3        SEND_VAL                                                 '%241'
         4        SEND_VAL                                                 'Grapa%5CCli%5CDb'
         5        DO_ICALL                                         $0      
         6        SEND_VAR                                                 $0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0