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<?php echo preg_replace_callback('/(\d\d?:\d\d)-(\d\d?:\d\d)/', function($match){ return ' ' . date('H:i', strtotime($match[1])) . '-' . date('H:i', strtotime($match[2])); }, 'mo-sa9:00-20:00uhr');
Output for rfc.property-hooks, git.master, git.master_jit
mo-sa 09:00-20:00uhr

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