Re: [exim] Counting the number of headers in an incoming ema…

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Author: Lena
Date:  
To: exim-users
Subject: Re: [exim] Counting the number of headers in an incoming email
> .+ one or more of any character

Any character except a newline. So, no backtracking.

> Would there be any advantage to using "(?: )" instead of "( )" to
> avoid the cost of storing matched substrings?

Yes, but I chose better readability.

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