[Evolution] Boolean filter expressions

Is there a way to use boolean expressions in filters? For example, say I
want to filter all HTML mail that contains the phrase "click here", case
insensitive. (That's right, a spam filter.) As a boolean expression it's

(<html> OR <HTML>) AND ("click here" OR "CLICK HERE")

But the filter dialog seems to limit me to using either AND or OR but
not both (specifically, either "if all criteria are met" or "if any
criteria are met"). There's a promising sounding option called
"expression" in there but I can't figure out the syntax it expects.


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