Is the R before string cross-platform

Question

From MSDN, this code is used in order to match regular expression:

if (regex_match(s, m, regex { R"((\w+) (\w+))" }))
{
}

Is using the R before the string quota a standard C++?

Answer 1

Yes it's standard C++. So as such is cross-platform. According to cppreference:

prefix(optional) R "delimiter( raw_character* )delimiter" 

Represents raw string literal. Used to avoid escaping of any character, anything between the delimiters becomes part of the string, if prefix is present has the same meaning as described above.

Answer 2

Yes; this notation is known as a "raw string literal", and was standardized in C++11. Further (non-MSDN) documentation can be found here.