Re: [exim] Why doesn't MIME file extension match on this ACL…

Philip Hazel wrote:

> ^(?>.*)(?<=abc|defg|hijkl|...)

errr... have to look up what this in detail means.

> is the fastest way to match "ends with abc or defg or hijkl or..." because
> there is no backtracking. The only restriction is that each alternative
> must be of a fixed length.

so your example is not valid? (length(abc) != length(defg))