//Write a Boolean method that extracts the digits from a string
//representing a phone number and
//confirms that it contains exactly 10 digits.
public static bool ValidatePhoneNumber(string input)
{
return(YKStringUtilities.RemovePunctuation(input).Length == 10);
}
//Write a Boolean method that extracts the digits from a string
//representing a US Zip Code and
//confirms that it contains either 5 or 9 digits.
//This should be a one-liner.
public static bool ValidateUPZipCode(string input)
{
return(YKStringUtilities.RemovePunctuation(input).Length == 5 || YKStringUtilities.RemovePunctuation(input).Length == 9);
}