I felt an itch to try to do this in one regex. Admittedly it's a longer string than checking with two short ones, but here's a single regex that I believe does the same thing:
Basically, "There must be a single character that is a letter, a dash, or an underscore. It can also have any number of characters before or after it if none of those characters are anything but word characters (letters or underscores) or dashes."
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