fix to the issue #90

[ekamioka]

Hey @Ironholds

AlexCP said maybe I can help, so here is my PR in hope to solve it.

I added new tests to ensure I am doing the thing (and also not breaking the codebase). Running results was:

==> Testing R file using 'testthat'

✔ | OK F W S | Context
✔ | 55       | URL parsing tests [0.2 s]

══ Results ════════════════════
Duration: 0.3 s

OK:       55
Failed:   0
Warnings: 0
Skipped:  0

Test complete

[Ironholds]

Does this work nicely on Windows machines as well? I know there are historical legacy issues with getting R to play nice with the regex header there.

[Ironholds]

Might suggest compiling the regex on package instantiation for a speed bump rather than recompiling it with every individual call? This is going to mean a lot of compilations!

[alexcpsec]

@Ironholds I know nothing about RCpp packages, but can we add the --std=c++11 flag to the build process so it can add that independently if I do not have it on my RMakevars ?

[Ironholds]

Hm; I don't remember either. I think the DESCRIPTION should now let you specify? It's been a while.

[ghost]

@Ironholds I know nothing about RCpp packages, but can we add the --std=c++11 flag to the build process so it can add that independently if I do not have it on my RMakevars ?

I've just tested and adding PKG_CXXFLAGS=-std=c++11 to .R/Makevars or setting Sys.setenv("PKG_CXXFLAGS"="-std=c++11") will do the work.

PS. gcc version must be greater or equals to 4.9

[Ironholds]

And does R now require C++11 support? (that is, is it likely to be on target machines?)

[alexcpsec]

Nah, the thing here is that Eduardo's proposed fix was to use `<regex>` which is a C++11 construct. So instead of forcing the user to manually add C++11 support to all his packages (say in RMakevars), I was wondering if we could just do it for the package itself. Another option is to solve this issue without `<regex>` :)

…

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