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Use regular expressions to verify whether input on the login page meets the requirements_regular expression

韦小宝Original: 2018-05-25 14:57:102766browse

This article mainly introduces the example code that uses regular expressions to verify whether the input on the login page meets the requirements. In the actual development process, regular expressions play a very important role, and regular expressions are also more difficult. Learning is not easy to understand. Friends in need can refer to

. Let me show you the renderings first:

No more nonsense, I will directly post the code for you, the specific code As shown below:

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 </head>
 <script src="js/jquery-1.8.0.min.js"></script>
 <script>
 $(function() {
  $("input[name=&#39;uname&#39;]").blur(function() { //失去焦点
  var namestr = $(this).val();
  var regstr = /^[\u4e00-\u9fa5]{2,4}$/;
  if(!regstr.test(namestr)) {
   $(this).parent().next().html("用户名必须是2-4个汉字").css("color", "red");
   return false;
  }
  return true;
  }); 
  $("input[name = &#39;uname&#39;]").focus(function() { //获取焦点
  $(this).val("");
  $(this).parent().next().html("");
  });
  $("input[name=&#39;pwd&#39;]").blur(function() {
  var pwdstr = $(this).val();
  var regstr = /^\w{6}$/;
  if(!regstr.test(pwdstr)) {
   $(this).parent().next().html("密码必须是6位数字字母下划线").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;pwd&#39;]").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name=&#39;birthday&#39;]").blur(function() {
  var birthdaystr = $(this).val();
  var regstr = /^(19|20)\d{2}-(1[0-2]|0?[1-9])-(3[0-1]|2[0-9]|0?[1-9])$/;
  if(!regstr.test(birthdaystr)) {
   $(this).parent().next().html("日期格式不正确").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;birthday&#39;]").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name=&#39;email&#39;]").blur(function(){
  var emailstr = $(this).val();
  var regstr = /^[\w\-]+@[a-z0-9A-Z]+(\.[a-zA-Z]{2,3}){1,2}$/;
  if(!regstr.test(emailstr)){
   $(this).parent().next().html("邮箱格式不正确").css("color","red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;email&#39;]").focus(function(){
  $(this).parent().next().html("");
  });
 });
 </script>
 <style>
 body {
  font-size: 12px;
 }
 #home {
  background-color: beige;
  border: solid 1px black;
  width: 550px;
  height: 185px;
  margin: auto;
  margin-top: 20px;
 }
 #head {
  height: 135px;
 }
 #foot {
  text-align: center;
 }
 .dl1 {
  clear: both;
  padding-left: 10px;
 }
 .dl1 dt {
  float: left;
  height: 30px;
  width: 80px;
  line-height: 30px;
 }
 .dl1 dd {
  float: left;
  height: 30px;
  line-height: 30px;
  /*width: 250px;*/
 }
 #btn_res {
  background-image: url(img/reset.gif);
  width: 80px;
  height: 34px;
 }
 #btn_sub {
  background-image: url(img/submit.gif);
  width: 80px;
  height: 34px;
 }
 </style>
 <body>
 <p id="home">
  <p id="head">
  <form action="" method="post">
   <dl class="dl1">
   <dt>用户名 : </dt>
   <dd class="dd1"><input type="text" value="输入用户名" name="uname" /></dd>
   <dd></dd>
   </dl>
   <dl class="dl1">
   <dt>用户密码 : </dt>
   <dd class="dd1"><input type="password" name="pwd" /></dd>
   <dd></dd>
   </dl>
   <dl class="dl1">
   <dt>出生日期 : </dt>
   <dd class="dd1"><input type="text" name="birthday" /></dd>
   <dd>yyyy-mm-dd</dd>
   </dl>
   <dl class="dl1">
   <dt>用户邮箱 : </dt>
   <dd><input type="text" name="email"/></dd>
   <dd></dd>
   </dl>
  </form>
  </p>
  <p id="foot">
  <input type="submit" value="" id="btn_sub" />
  <input type="reset" value="" id="btn_res" />
  </p>
 </p>
 </body>
</html>

Summary

The above is the editor’s introduction to using regular expressions to verify whether the input on the login page conforms to the Requirements, hope it helps everyone! !

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