This rule is part of MISRA C++:2023.
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Rule 5.13.1 - Within character literals and non raw-string literals, \ shall only be used to form a defined escape sequence or
universal character name
[lex.ccon] Implementation 7, 9
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Category: Required
Analysis: Decidable,Single Translation Unit
Amplification
The escape sequences defined within the C++ Standard are:
\n, \t, \v, \b, \r, \f, \a, \\, \?, \', \", \<Octal Number>, \x<Hexadecimal Number>
The universal character names are:
\u hex-quad, \U hex-quad hex-quad
Rationale
The use of an undefined escape sequence results in implementation-defined behaviour.
Example
void fn()
{
const char * a = "\k"; // Non-compliant
const char * b = "\b\u00E9"; // Compliant
}
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