User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3 Build Identifier: Mozilla Thunderbird 0.8 (20040913) Thunderbird users should be able to use regular expressions when creating filters. I am a former user of TheBat!, a commercial MUA, and its regex filtering was _the_ feature that put it ahead of all other GUI mailers. A recent PCRE engine would be ideal. Reproducible: Always Steps to Reproduce: 1. Hit Tools | Message Filters 2. Hit New... 3. Select the operator pull-down ("contains," "doesn't contain," etc.) Actual Results: There is no option for "matches regular expression." Expected Results: Offer a "matches regular expression" option.

+1 I'm seeinga lot of "undeliverable/returned mail" spam which tends to have a set format in the spoofed "from" address. being able to use a regex would mean i could automate the junking of most of these messges.

this is dupe of bug 19442

*** This bug has been marked as a duplicate of 19442 ***