Validate format of record names (or labels, as BIND calls them)
Validate format of record names (or labels, as BIND calls them)

We're using the regexp provided by the best answer at
http://stackoverflow.com/questions/2063213/regular-expression-for-validating-dns-label-host-name

For the record, this feature was requested by Bergo on July 4th (item 14
of the spreadsheet)

globocom/GloboDNS,globocom/GloboDNS,globocom/GloboDNS,globocom/GloboDNS