Phone Number Validation Class using IDictionary

Class:
public class PhoneValidator {

static IDictionary<string, Regex> countryRegex = new Dictionary<string, Regex>() {

{ "USA", new Regex("^[2-9]\\d{2}-\\d{3}-\\d{4}$")},

{ "UK", new Regex("(^1300\\d{6}$)|(^1800|1900|1902\\d{6}$)|(^0[2|3|7|8]{1}[0-9]{8}$)|(^13\\d{4}$)|(^04\\d{2,3}\\d{6}$)")},

{ "Netherlands", new Regex("(^\\+[0-9]{2}|^\\+[0-9]{2}\\(0\\)|^\\(\\+[0-9]{2}\\)\\(0\\)|^00[0-9]{2}|^0)([0-9]{9}$|[0-9\\-\\s]{10}$)")},

};

public static bool IsValidNumber(string phoneNumber, string country) {

if (country != null && countryRegex.ContainsKey(country))

return countryRegex[country].IsMatch(phoneNumber);

else

return false;

}

public static IEnumerable<string> Countries {

get {

return countryRegex.Keys;

}

}

}

Calling:

if (!PhoneValidator.IsValidNumber("+1-1234-232-232", "USA"))

      Console.Writeline('Enter Valid Phone Number');