[exim] retry rules with regular expressions

Dear all,

In exim manual I read that:

"Warning: If you use a regular expression in a routing rule pattern, it
must match a complete address, not just a domain, because that is how
regular expressions work in address lists."

I would like to handle shorter retry times to all yahoo domains. I know I
could use the pattern
yahoo.com
yahoo.ca
etc.

Is this the only way to go or can I somehow specify yahoo.* to match all
yahoo domains and specify shorter max-mail-in-queue time for it?

Thanks!

--
Zbigniew Szalbot