[Solved] c++ Check if string is valid Integer or decimal (both negative and positive cases)

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The answer was a simple Regex:

bool regexmatch(string s){

    regex e ("[-+]?([0-9]*\.[0-9]+|[0-9]+)");

    if (regex_match (s,e))
        return true;

    return false;
}

It will return true on integers (i.e. 56, -34) and floating point numbers (i.e. 6.78, -34.23, 0.6) as expected.

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solved c++ Check if string is valid Integer or decimal (both negative and positive cases)