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<?php $string = '1234567890'; echo preg_replace('/\d{3}\K/', '-', $string, 2); echo "\n---\n"; vprintf('%s-%s-%s', sscanf($string, '%3s%3s%4s')); echo "\n---\n"; echo implode('-', sscanf($string, '%3s%3s%4s'));
Output for git.master, git.master_jit, rfc.property-hooks
123-456-7890 --- 123-456-7890 --- 123-456-7890

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