Looking at the RFC again (http://tools.ietf.org/html/rfc3164#section-5.3) it looks like our decoding is not strictly correct, we should delimit on any non-alpha chars, not just `:`.

The RFC is not clear http://tools.ietf.org/html/rfc3164#section-4.1.3

Whether it's allowed or not, we should be lenient (Postel's law).

BTW, the RFC in the javadoc is wrong - that's a newer format; our decoder is 3164.