Regular Expression Character Classes define a group of characters we can use in conjunction with quantifiers.
var str = `cat bat mat Hat 0at ?at`; var regex = /[bc]at/g; // match ‘cat bat‘ // the same as: var regex = /(b|c)at/g; var regex = /[^bc]at/g; // matcg ‘mat Hat 0at ?at‘ var regex = /[a-zA-Z0-9?]at/g; // match all the string,
[Regex Expression] Find Sets of Characters
原文：http://www.cnblogs.com/Answer1215/p/5174333.html