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Validate input content on login page using regular expressions

php中世界最好的语言
php中世界最好的语言Original
2018-03-29 11:27:253950browse

This time I will bring you the use of regular expressions to verify the input content of the login page, and what are the precautions for using regular expressions to verify the input content of the login page. Here is the actual combat Let’s take a look at the case.

Let me show you the renderings first:

Without further ado, I will just post the code for you. The specific code is as follows:

<!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='uname']").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 = 'uname']").focus(function() { //获取焦点
  $(this).val("");
  $(this).parent().next().html("");
  });
  $("input[name='pwd']").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='pwd']").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name='birthday']").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='birthday']").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name='email']").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='email']").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>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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The use and basic syntax of JS regular expressions

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