6-1 只获取字母,数字
var str ="abc123";
var reg = /[^abc]/g; //只获取字母,不是abc的去掉
console.log(str.replace(reg,"*"));
var test = "?@hello123-";
/* 123 */
var reg = /[^\d]/g; //只获取数字,不是数字的去掉
console.log(test.replace(reg,""))
6-2 过滤标签
var str ="<p>风戽哟西</p><br/><span>666</span>";
/* 风戽哟西666 */
var reg = /<[^<>]+>/g //html标签的正则
console.log(str.replace(reg,""))