常用正则表达式

用户名/^[a-z0-9_-]{3,16}$/

密码/^[a-z0-9_-]{6,18}$/

十六进制值/^#?([a-f0-9]{6}|[a-f0-9]{3})$/

电子邮箱/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/

/^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/

URL/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/

IP 地址/((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/

/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/

HTML 标签/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/

删除代码\\注释(?

Unicode编码中的汉字范围/^[\u2E80-\u9FFF]+$/