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<?php var_dump(preg_replace('{^(\\\\.+)\\\\[^\\\\]+$|^([^\\\\]+)\\\\[^\\\\]+$}', '$1', 'Grapa\\Cli\\Db'));
based on krmPN
Output for 4.3.0 - 7.2.0
string(12) "Grapa\Cli\Db"