Avoids at-codes such as at0000.1.1, which seems too restrictive.
Current regex is ([a-zA-Z]\w+[a-zA-Z]\w+[a-zA-Z]\w+\.[a-zA-Z]\w+(-\w+)?\.v\d+(\.\d+\.\d+)?((-rc|-alpha)(\.\d+)?)?)|(at\d{1,4}(\.\d{1,4})?)
Probably should be ([a-zA-Z]\w+[a-zA-Z]\w+[a-zA-Z]\w+\.[a-zA-Z]\w+(-\w+)?\.v\d+(\.\d+\.\d+)?((-rc|-alpha)(\.\d+)?)?)|(at\d{1,4}(\.\d{1,4})*)