[RF] Remove RooFormula code for gcc <= 4.8 when minimum standard is raised to C++17

[guitargeek]

This issue serves as a reminder that the code behind #ifndef ROOFORMULA_HAVE_STD_REGEX in RooFormula.cxx can be removed once the minimum C++ standard for ROOT is raised to C++17, because then gcc 4.8 is not supported anymore anyway. At that point, std::regex probably also works with visual studio, so the #ifndef _MSC_VER check can probably be removed in the same go.

See #8583 as a reference for what files to check to know what the minimum supported C++ standard of ROOT is.

[hahnjo]

I think already the switch to C++14 made GCC 4.8 effectively unsupported, so you may already be able to do this now?

[guitargeek]

Okay that may be, I don't remember this very well. I have opened a PR to remove it and I'll just ask in the daily or group meeting if anyone has objections. Thanks for pointing this out!

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖