5 Lexical conventions [lex]

5.13 Literals [lex.literal]

5.13.6 Unevaluated strings [lex.string.uneval]

Each universal-character-name and each simple-escape-sequence in an unevaluated-string is replaced by the member of the translation character set it denotes.
An unevaluated-string is never evaluated and its interpretation depends on the context in which it appears.