range method

new RegExpBuilder().range('numbers'); // [0-9]
new RegExpBuilder().range(1, 8); // [1-8]
new RegExpBuilder().range('lowercase'); // [a-z]
new RegExpBuilder().range('uppercase'); // [A-Z]
new RegExpBuilder().range('alphabet'); // [a-zA-Z]

Wouldn't creating this method be better than declaring const NUMBERS = '[0-9]'?