[SC-Help] Filter: limited to "contains" and "doesn't contain"

[Peter Pearson]

I'm a subscriber to Spamcop's email service.
I want to create a filter that reacts to digits appearing in
words, using the regular expression [a-zA-Z][01][a-zA-Z]. On
the filter-building page for my Spamcop email account, I can
select "Subject" and "contains" and specify the regular expression,
but from the Help popup I understand that I must select "regexp"
to get regular-expression matching. Perplexingly, "regexp" is
not offered by the type-of-comparison selector: only "contains"
and "doesn't contain" are offered.

I've scrutinized the official and unofficial FAQs, Googled Web 
and Groups, and perused the entire Options menu looking for an 
"I'm a novice so don't show me any complex options" checkbox to 
uncheck, all to absolutely no avail.

How can I get the regular-expression matching described in the
Filter-Rule help popup?

Thanks -
Peter
-- 
To email me, swap the words adjoining the hyphen and delete it.