Example introduction to regular expression form validation
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!
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