Regex 101 Exercise S3 - Validate a zip+4 zip code

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Exercise S3 - Validate a zip+4 zip code.

The US has a 5 digit zip code with an optional 4 digit suffix. Write a regex to validate that the input is in the proper format:

Sample strings

98008
98008-4893

I'm going to keep comments enabled in case people have questions about the exercise, but please don't post answers in the comments.