Your question doesn't make sense. Do you mean a regular expression that will match 'Road' in each of those? If so, it's easy /Road/, but I suspect you'll want to expand your question a bit.
In general, you cannot validate at this level of detail, because addresses like "The Batman, c/o Gotham City PD" will always fail. With terrible consequences...
In general, you cannot validate at this level of detail, because addresses like
"The Batman, c/o Gotham City PD" will always fail. With terrible consequences...
hmm, what do you propose?
Reward your customer, such as with free software, for providing correct info? (-: