Multiple prefixes and suffixes in hints

[Doug Hardie]

I don't see anything in the docs, but is it possible to have hints  
entries that distinguish between:

userid
xx+userid
userid at yyy
xx+userid at yyy

Such that  a different hint is given for each of the above forms.

The first 3 are easy.  The last one is the issue.  I am guessing that  
an entry along the form of:

DEFAULT  Prefix == "xx", Suffix== "@yyy", Strip-User-name = Yes
	Hint = "4th-form"

would be used.