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<?php echo preg_replace_callback('/(ä)|(ö)|(ü)|(Ä)|(Ö)|(Ü)|(ß)/', function($matches){ foreach($matches as &$match){ switch($match){ case 'ü': $match = 'ue'; break; case 'ö': $match = 'oe'; break; case 'ä': $match = 'ae'; break; case 'Ü': $match = 'Ue'; break; case 'Ö': $match = 'Oe'; break; case 'Ä': $match = 'Ae'; break; case 'ß': $match = 'ss'; break; } } }, 'äöüÄÖÜß');
Output for git.master, git.master_jit, rfc.property-hooks

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