In almost all examples are about converting roman numbers to integer. Does it make sense to convert one by one all roman numbers and then check if that number is a greater than 0?
Not sure if you can find anything form the box. To create own function :
private static Dictionary<char, int> _romanMap = new Dictionary<char, int>
{
{'I', 1}, {'V', 5}, {'X', 10}, {'L', 50}, {'C', 100}, {'D', 500}, {'M', 1000}
};
public static int IsRoman(string text) {
foreach (var c in text)
if (!_romanMap.ContainsKey(char))
return 0;
return 1
}