This time I will bring you regular expressionform validationexample introduction, the following is a practical case, let’s take a look
First of all, I will explain to you the meaning of some symbols.
* matches the previous subexpression zero or more times;
^ matches the starting position of the input character string; $matches the end position of the input string
1. /^$/ This is a general format.
2. Enter the functions that need to be implemented.
\d matches a numeric character, equivalent to [0-9]
+ matches the previous subexpression one or more times;
? Match the previous subexpression zero or once;
The following is a piece of code to analyze Form verificationRegular expression, the specific code is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-">
<title>正则验证常用表单方法</title>
<script type="text/javascript">
function focus_username() {
var resultObj=document.getElementById('result_username');
resultObj.innerHTML="以字母开头的-位的字符";
resultObj.style.color="blue";
document.form.username.style="border:px solid red";
}
// function blur_username () {
//第一种方法：
// var resultObj=document.getElementById('result_username')
// if (document.form.username.value=='') {
// resultObj.innerHTML="用户名不能为空";
// resultObj.style.color="red";
// return false;
// }else if (document.form.username.value.length<||document.form.username.value.length>) {
// resultObj.innerHTML="用户名字符长度必须介于到个之间";
// resultObj.style.color="red";
// return false;
// }else{
// resultObj.innerHTML="ok";
// resultObj.style.color="green";
// }
// }
function blur_username () {
//第二种方法：
var resultObj=document.getElementById('result_username')
var pre=document.form.username.value;
var reg=/^[a-zA-Z]\w{,}$/;
if (pre=='') {
resultObj.innerHTML="(必填项)用户名不能为空";
resultObj.style.color="red";
return false;
}else if (!reg.test(pre)) {
resultObj.innerHTML="用户名字符输入不合法";
resultObj.style.color="red";
return false;
}else{
resultObj.innerHTML="ok";
resultObj.style.color="green";
return true;
}
}
function focus_userpwd() {
var resultObj=document.getElementById('result_userpwd');
resultObj.innerHTML="(必填项)介于-位的非特殊字符";
resultObj.style.color="blue";
document.form.userpwd.style="border:px solid red";
}
// function blur_userpwd () {
// var resultObj=document.getElementById('result_userpwd')
// if (document.form.userpwd.value=='') {
// resultObj.innerHTML="用户名密码不能为空";
// resultObj.style.color="red";
// return false;
// }else if (document.form.userpwd.value.length<||document.form.userpwd.value.length>) {
// resultObj.innerHTML="用户名密码字符长度必须介于到个之间";
// resultObj.style.color="red";
// return false;
// }else{
// resultObj.innerHTML="ok";
// resultObj.style.color="green";
// return true;
// }
// }
function blur_userpwd () {
var resultObj=document.getElementById('result_userpwd')
var pre=document.form.userpwd.value;
var reg=/^\w{,}$/;
if (pre=='') {
resultObj.innerHTML="(必填项)用户名密码不能为空";
resultObj.style.color="red";
return false;
}else if (!reg.test(pre)) {
resultObj.innerHTML="用户名密码字符输入不合法";
resultObj.style.color="red";
return false;
}else{
resultObj.innerHTML="ok";
resultObj.style.color="green";
return true;
}
}
function focus_userpwd() {
var resultObj=document.getElementById('result_userpwd');
resultObj.innerHTML="(必填项)介于-位的非特殊字符";
resultObj.style.color="blue";
document.form.userpwd.style="border:px solid red";
}
// function blur_userpwd () {
// var resultObj=document.getElementById('result_userpwd')
// if (document.form.userpwd.value=='') {
// resultObj.innerHTML="用户名密码不能为空";
// resultObj.style.color="red";
// return false;
// }else if (document.form.userpwd.value!=document.form.userpwd.value) {
// resultObj.innerHTML="两次用户名密码输入不一致";
// resultObj.style.color="red";
// return false;
// }else{
// resultObj.innerHTML="ok";
// resultObj.style.color="green";
// return true;
// }
// }
function blur_userpwd () {
var resultObj=document.getElementById('result_userpwd')
var pre=document.form.userpwd.value;
var reg=/^\w{,}$/;
if (pre=='') {
resultObj.innerHTML="(必填项)用户名密码不能为空";
resultObj.style.color="red";
return false;
}else if (!reg.test(pre)) {
resultObj.innerHTML="用户名密码字符输入不合法";
resultObj.style.color="red";
return false;
}else if(document.form.userpwd.value!=document.form.userpwd.value){
resultObj.innerHTML="两次用户名密码输入不一致";
resultObj.style.color="red";
return false;
}else {resultObj.innerHTML="ok";
resultObj.style.color="green";
return true;
}
}
function focus_Mobile() {
var resultObj=document.getElementById('result_Mobile');
resultObj.innerHTML="请输入你位数的手机号码";
resultObj.style.color="blue";
document.form.Mobile.style="border:px solid red";
}
function blur_Mobile() {
var resultObj=document.getElementById('result_Mobile')
var pre=document.form.Mobile.value;
var reg=/^[||][-]{}$/;
if (pre=='') {
resultObj.innerHTML="手机号码不能为空";
resultObj.style.color="red";
}else if (!reg.test(pre)) {
resultObj.innerHTML="手机号码字符输入不合法";
resultObj.style.color="red";
}else {
resultObj.innerHTML="ok";
resultObj.style.color="green";
}
}
function focus_Tel() {
var resultObj=document.getElementById('result_Tel');
resultObj.innerHTML="请输入你的座机号码";
resultObj.style.color="blue";
document.form.Tel.style="border:px solid red";
}
function blur_Tel() {
var resultObj=document.getElementById('result_Tel')
var pre=document.form.Tel.value;
var reg=/^{}[-]{,}\-[]?[-]{}$/;
if (pre=='') {
resultObj.innerHTML="座机号码不能为空";
resultObj.style.color="red";
}else if (!reg.test(pre)) {
resultObj.innerHTML="座机号码字符输入不合法";
resultObj.style.color="red";
}else {
resultObj.innerHTML="ok";
resultObj.style.color="green";
}
}
function focus_mail() {
var resultObj=document.getElementById('result_mail');
resultObj.innerHTML="请输入你的邮箱号码";
resultObj.style.color="blue";
document.form.mail.style="border:px solid red";
}
function blur_mail() {
var resultObj=document.getElementById('result_mail');
var pre=document.form.mail.value;
var reg=/^[a-zA-Z-][a-zA-Z-\._]+@[a-z-]+\.(com)(\.(cn))?$/;
if (pre=='') {
resultObj.innerHTML="邮箱号码不能为空";
resultObj.style.color="red";
}else if (!reg.test(pre)) {
resultObj.innerHTML="邮箱号码字符输入不合法";
resultObj.style.color="red";
}else {
resultObj.innerHTML="ok";
resultObj.style.color="green";
}
}
function focus_ID() {
var resultObj=document.getElementById('result_ID');
resultObj.innerHTML="(必填项)请输入你位的二代身份证号码";
resultObj.style.color="blue";
document.form.ID.style="border:px solid red";
}
function blur_ID() {
var resultObj=document.getElementById('result_ID');
var pre=document.form.ID.value;
var reg=/^[-]{}[-x]$/;
if (pre=='') {
resultObj.innerHTML="(必填项)二代身份证号码字符不能为空";
resultObj.style.color="red";
return false;
}else if (!reg.test(pre)) {
resultObj.innerHTML="二代身份证号码字符输入不合法";
resultObj.style.color="red";
return false;
}else {
resultObj.innerHTML="ok";
resultObj.style.color="green";
return true;
}
}
function checkForm(){
var flag_username=blur_username();
var flag_userpwd=blur_userpwd();
var flag_userpwd=blur_userpwd();
var flag_ID=blur_ID();
if (flag_username==true&&flag_userpwd==true&&flag_userpwd==true&&flag_ID==true) {
return true;
}else{
return false;
}
}
</script>
<style type="text/css">
body{background-image: url(images/.jpg);background-size: cover;}
table{margin-left: px;margin-top: px;background-image: url(images/.jpg);background-size: cover;box-shadow: px px px #C}
.vip{font-size: px;}
</style>
</head>
<body>
<form name="form" action=".php" method="post" onsubmit="return checkForm()">
<table width="px" border="px" bordercolor="red" cellpadding="px" cellspacing="px" align="center" >
<tr>
<th colspan="" class="vip">VIP会员注册</th>
</tr>
<tr>
<td width="px" align="right" >用户名：</td>
<td width="px"><input type="text" name="username" onfocus="focus_username()" onblur="blur_username()" ></td>
<td><div width="px" id="result_username"></div></td>
</tr>
<tr>
<td align="right">密码：</td>
<td><input type="password" name="userpwd" onfocus="focus_userpwd()" onblur="blur_userpwd()" /></td>
<td><div id="result_userpwd"></div></td>
</tr>
<tr>
<td align="right">确认密码：</td>
<td><input type="password" name="userpwd" onfocus="focus_userpwd()" onblur="blur_userpwd()"/></td>
<td><div id="result_userpwd"></div></td>
</tr>
<tr>
<td align="right">手机号码：</td>
<td><input type="text" name="Mobile" onfocus="focus_Mobile()" onblur="blur_Mobile()"/></td>
<td><div id="result_Mobile"></div></td>
</tr>
<tr>
<td align="right">座机号码：</td>
<td><input type="text" name="Tel" onfocus="focus_Tel()" onblur="blur_Tel()"/></td>
<td><div id="result_Tel"></div></td>
</tr>
<tr>
<td align="right">邮箱号码：</td>
<td><input type="text" name="mail" onfocus="focus_mail()" onblur="blur_mail()"/></td>
<td><div id="result_mail"></div></td>
</tr>
<tr>
<td align="right">二代身份证：</td>
<td><input type="text" name="ID" onfocus="focus_ID()" onblur="blur_ID()"/></td>
<td><div id="result_ID"></div></td>
</tr>
<tr>
<td align="center" colspan=""><input type="submit" value="提交注册" />
<input type="reset" value="重置资料" /></td>
<td></td>
</tr>
</table>
</form>
</body>
</html>I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the PHP Chinese website!
Related reading:
How to upload an avatar in the WeChat applet
How can the search component of mint-ui be displayed on the keyboard Search button
How jQuery implements front-end search function
The above is the detailed content of Example introduction to regular expression form validation. For more information, please follow other related articles on the PHP Chinese website!
Summary of java basic knowledge
Commonly used expressions in php
What to do if the documents folder pops up when the computer is turned on
How to turn off windows security center
Windows 10 service outage time
How to set up the router
Win11 skips the tutorial to log in to Microsoft account
What software is ig
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
