You did not state in your post that you do not use https, so i did falsely assume that.! R80.30 has several shortcomings - a MABDA HF (sk113410) should only be available in July, also a new build is planned for ca. 2 month from now. At least, we have a R80.30 MTA Update HF...
Using RegEx for DOS sounds interesting, please point out that paper to us all ! Up to now, the danger was that people use RegEx expressions with a wrong syntax (i at least had some customers that did that), so it did not work as expected.
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