正则表达式表单验证实例代码详解
这篇文章主要介绍了正则表达式表单验证实例详解的相关资料,大家可以参考下。正则表达式表单验证具体内容如下：
首先给大家解释一些符号相关的意义
* 匹配前面的子表达式零次或多次；
^ 匹配输入字符串的开始位置；$匹配输入字符串的结束位置
1. /^$/ 这个是个通用的格式。
2. 里面输入需要实现的功能。
\d 匹配一个数字字符，等价于[0-9]
+ 匹配前面的子表达式一次或多次；
？匹配前面的子表达式零次或一次；
下面通过一段代码给大家分析表单验证正则表达式，具体代码如下：
<!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> 以上内容就是表单验证正则表达式实例代码，希望对大家有帮助。
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