Looking for ideas to lower binding overhead for lua-re2. in plain-text)

[lua.greatwolf@...]

> You should be using luaL_checklstring() here. You can pass a pointer _and_
> the length to the StringPiece constructor:
>
> 	size_t n;
> 	const char *p = luaL_checklstring(L, 2, &n);
> 	StringPiece subject(p, (int)n);
>   
> ...

Thank you for catching this! I did not realize the significance of this until resting a bit and 
reviewing this with a fresh pair of eyes.

Now I feel like an idiot -- in hindsight I should have realized this was the problem. I even looked 
at stringpiece.h at one point and saw that the constructor for StringPiece(const char *) *uses 
strlen* to determine the length of the string. But alas, I didn't make the mental connection sooner 
that this linear time operation was the root cause of the performance impact -- I should have though.

Fixing this silly oversight mitigates the overhead I was seeing. Thanks again and sorry for the noise!