[LLVMdev] Regular Expression lib support

[Sebastian Redl]

OvermindDL1 wrote:
> Again, why not Spirit2.1, works just fine on C++98, and it is fast,
> and it is split up into the smallest bits so you only include what you
> use, and the assembly it compiles into is *very* tiny, far far less
> then any regex library could possibly be.
>   

Spirit is not an option for one simple reason: FileCheck needs to parse
regexes from its instruction comments at runtime and execute them. It
has no idea, at compile time, what these regexes will be.

Sebastian