[WORK] startsWith

[via Digitalmars-d]

On Saturday, 14 February 2015 at 17:52:09 UTC, Andrei 
Alexandrescu wrote:
> I just submitted an optimization for skipOver for strings: 
> https://github.com/D-Programming-Language/phobos/pull/2986.
>
> I noticed startsWith should be similarly optimized. If anyone 
> would want to work on that, it would be great.

The range version of startsWith (which I suspect is the most 
commonly used one) is optimized beautifully. This leaves the 
(rather trivial) single element one and the "one haystack, any of 
these needles" one.