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<?php $re = '/\b[a-z]+-[a-z]+\K\d:\d\d-\d\d:\d\duhr\b/'; $norm = 'mo-sa9:00-20:00uhr'; echo preg_replace($re, " 0$0", $norm);
Output for git.master, git.master_jit, rfc.property-hooks
mo-sa 09:00-20:00uhr

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