遗憾的是博客内容不允许包含js代码,不能在线测试，就只上代码了
<!DOCTYPE html><html><head> ???<meta charset="utf-8"> ???<title>Regular Expression test</title></head><body> ????用户名：(4-16位，字母、下划线、数字，减号) <br/> ????<input type="text" id="un" placeholder="4-16位" > ?????<input type="button" value="test" onclick="userName()" > ?????<span id="one"></span> ????<br/><hr/> ????密码：(最少6位，至少包括一个大写字母、一个小写字母、一个数字、一个特殊字符) <br/> ????<input type="text" id="pw" > ?????<input type="button" value="test" onclick="password()" > ?????<span id="two"></span> ?????<br/><hr/> ????邮箱：(xxx@xx.xxx)<br/> ????<input type="text" id="em" > ?????<input type="button" value="test" onclick="email()" > ?????<span id="three"></span> ??????????<br/><hr/> ????身份证号：18位，最后一位可以是数字或字母<br/> ????<input type="text" id="idn" > ?????<input type="button" value="test" onclick="idNumber()" > ?????<span id="four"></span><script type="text/javascript">function userName(){ ???????var reg=/^\w{4,16}$/; ???????if( !reg.test( document.getElementById("un").value ) ) ????????????document.getElementById("one").innerHTML="不正确"; ???????else ????????????document.getElementById("one").innerHTML="正确"; ???} ???function password(){ ???????var reg=/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*?[#?!@$%^&*-]).{6,}$/; ???????if( !reg.test( document.getElementById("pw").value ) ) ????????????document.getElementById("two").innerHTML="不正确"; ???????else ????????????document.getElementById("two").innerHTML="正确"; ???}function email(){ ???????var reg=/^\w+@[a-zA-Z0-9]{2,10}(?:\.[a-z]{2,4}){1,3}$/; ???????if( !reg.test( document.getElementById("em").value ) ) ????????????document.getElementById("three").innerHTML="不正确"; ???????else ????????????document.getElementById("three").innerHTML="正确"; ???}function idNumber(){ ???????var reg=/^\d{17}[A-z|0-9]{1}$/; ???????if( !reg.test( document.getElementById("idn").value ) ) ????????????document.getElementById("four").innerHTML="不正确"; ???????else ????????????document.getElementById("four").innerHTML="正确"; ???} ???</script></body></html>js 正则表达式验证密码、邮箱格式.....
原文地址：https://www.cnblogs.com/hzhqiang/p/9863937.html