正则表达式
(MDN参考文档)[https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions]
var re = /ab+c/;
var re = new RegExp("ab+c");
str.replace(regexp|substr, newSubStr|function)
(MDN参考文档)[https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions]
var re = /ab+c/;
var re = new RegExp("ab+c");
str.replace(regexp|substr, newSubStr|function)