* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character -
literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\d matches a digit (equal to [0-9])
\w matches any word character (equal to [a-zA-Z0-9_])