* The '''<code>ship</code>''' matches the exact letters s, h, i, p in that order.
Regular expressions are quite powerful, and there are many options. We use the Python Regular Expression system, and we will document that here. In addition, you can use any Python Regular Expression resource.
''whitespace'' - The term "whitespace" is used below to mean one or more character that you don't see. For example, whitespace includes tabs, spaces, and newlines.