Declaring literal strings When I want to write a literal string in Python, I use r before the string (or @ in C#):

in [1]: print r'\no esca\pe ch\ara\cters'
out [1]: \no esca\pe ch\ara\cters


In straight c++ I can use R, but in the Arduino IDE, this throws the following error:

Serial.begin(9600);
Serial.println(R"\no esca\pe ch\ara\cters");

&lt;output&gt; invalid character '\'in raw string delimiter


So how do I do the same in Arduino c++?
Raw strings in C++11 must have parens within the quotes in order to allow for a custom delimiter. Since your string lacks those parens, it is not valid.

Serial.println(R"(\no esca\pe ch\ara\cters)");