[Solved] function for checking if a char array contains only allowed chars [closed]

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I would be tempted to use good old std::strspn like this:

bool containsOnlyAllowedSymbols(const char* equation)
{
    return std::strspn(equation, "0123456789+-*/()[]{}") == std::strlen(equation);
}

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solved function for checking if a char array contains only allowed chars [closed]