[正則表達式速查表](http://www.jb51.net/shouce/jquery1.82/regexp.html) [常用正則表達式](http://www.jb51.net/shouce/jquery1.82/regexp.html) |正則名稱|表達式| |--|--| |用戶名 |`/^[a-z0-9_-]{3,16}$/`| |密碼 |`/^[a-z0-9_-]{6,18}$/`| |十六進制值 |`/^#?([a-f0-9]{6}|[a-f0-9]{3})$/`| |電子郵箱 |`/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/`| |電子郵箱 |`/^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/`| |URL |`/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/`| |Unicode漢字范圍編碼|`/^[\u2E80-\u9FFF]+$/`| |HTML 標簽 |`/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/`| |IP 地址 |`/((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/`| |IP 地址 |`/^(?:(?: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]?)$/`| |刪除代碼\\注釋| `(?<!http:|\S)//.*$`| |圖像匹配|`http://.*?(jpg|png)`|