How to match a string like '+447537170394 <sms at aa.net.uk>' in a send hook?

[Chris Green]

I want to match the following string in a To: address for a send-hook:-

    +447537170394 <sms at aa.net.uk>

The + and < and > have special meanings (I think) in an RE, is there a
simple way to tell send-hook that this is just a string with no
special meanings at all or am I going to have to escape all the
specials?  If I do need to escape them all what do I actually need to
put?  Is it just:-

    '\+447537170394 \<sms\@aa\.net\.uk\>'

... just tried the above, it doesn't match.  So there must be more to
it.

-- 
Chris Green