I don't know what is the current status of v7, but this feature would be useful.
I've written a couple of aliases to emulate regex on binvar by using mIRC regex for %vars, but it has some limitations (and it's slower).

IF you notice, binvars don't have wildcard matching either. It's b/c that a binvar isn't plain text, it's binary(obviously), When you use bfind, I believe, it converts what you are looking for then makes an exact match(after discounting case).

If anything, I think the wildcards should be added first before the regex, :\