[llvm-dev] Use C++11 Regular Expressions

[Daniel Dilts via llvm-dev]

>
> > Do the supported compilers for building LLVM have sufficient support for
> the
> > C++11 regex library that this can be replaced with the standard library
> > implementation?
>
> <regex> was added to GCC's libstdc++ in 4.9, we currently support GCC
> starting from 4.7. I think all other supported compilers have <regex>.
>
> If I read things correctly from this page (
https://gcc.gnu.org/releases.html) and this old post (
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-October/066847.html), it
looks like we might be able to use the C++11 regex library for the 3.9
release.  Did I get that right?
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