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<?php $result = preg_replace('/(?<=[a-zA-Z])([A-Z])(?=[a-zA-Z])/', "_$1", 'spbAddress12'); print preg_replace('/([a-zA-Z][0-9])/', "_$1", $result);
Output for git.master, git.master_jit, rfc.property-hooks
spb_Addres_s12

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