26 
 string raw_str = R"(R"(foo)")";

If I have R"()" inside a raw string, and that causes the parser to confuse. (ie., it thought the left most )" was the end of the raw string.

How do I escape this?

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The format for the raw-string literals[2] is: R"delimiter( raw_characters )delimiter"

so you can use a different delimiter that is not in the string like:

string raw_str = R"~(R"(foo)")~";
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The raw string will terminate after the first )" it sees. You can change the delimiter to *** for example:

string raw_str = R"***(R"(foo)")***";
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