apache: filtering referrers?

[skirril]

Hello,

What's a good regexp to start with to filter/redirect all
queries to a dir/file, UNLESS they have my domain in the referrrer?

Needs to be put into .htaccess, system, in question is running apache 1.2

I do not want to let through everything, and block domains foo and bar.

ideas?

[DaveAtIFG]

Check here [brainstorm.co.uk] for a simple chart describing regular expressions. A guide to using redirection is here [engelschall.com] and Apache's docs are here [httpd.apache.org].