Re: [exim] How to disable logging unroutable addresses?

Jakob Hirsch wrote:
>
> Oh, cool, I didn't know that. Where is this documented? And is this
> still true if you run egrep and therefore tell grep to use the pattern
> as an extended regex? (hm, probably yes...)

That's the nature of a regexp. The regexp language is designed to be
compilable into an FSM (as long as backrefs aren't used) which can be
run very efficiently.

http://en.wikipedia.org/wiki/Regular_expression#Implementations_and_running_times

- Marc