More on Character Classes (Regex)

Complement of a character class

So far, we’ve used character classes like [aeiou] (listing all allowed characters literally) and [a-z] (specifying a range of characters).

There’s more to these.

We can negate classes by prepending a not character (^) inside the square brackets. For example, [^AEIOUaeiou] allows every character that’s not a vowel. So, we can find all words that don’t start with a vowel: