正则

1.匹配邮箱

let reg = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$

let reg = /^1[0-9]{10}$/;

let reg = /^1(3|4|5|7|8)[0-9]{9}$/;

let reg = /^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{8,16}$/;

let reg = /\d{3}-\d{8}|\d{4}-\d{7}/;

let reg=/(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;

let reg = /[1-9][0-9]{4,}/;

let reg = /\d+\.\d+\.\d+\.\d+/;

let reg = /^[\u4e00-\u9fa5]*$/