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run code in 200+ php & hhvm versions
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<?php var_dump(preg_replace('{^(\\\\?(?:[^\\\\]+\\\\)+)[^\\\\]+$}', '$1', 'Grapa\\Cli\\Db'));
based on 6ZTsp
Output for 4.3.0 - 7.2.0
string(10) "Grapa\Cli\"