negated character sets
(JavaScript)
To create a negated character set, you place a caret character (^)
after the opening bracket and before the characters you do not want to match.
For example, /[^aeiou]/gi matches all characters that are not a vowel.
Note that characters like ., !, [, @, / and white space are matched - the
negated vowel character set only excludes the vowel characters.