PHP regular expression verification email_PHP tutorial

Email verification codes are mostly unable to verify one-letter domain names or one-letter usernames, such as: i@fufuok.com or fufu@9.cn. The solution is as follows:

1. Do not judge the total length. You can add the length judgment yourself;

2, supports domain name suffixes such as .net.cn and .com.cn;

3. The email name part starts with a letter or number, and can have "-" and "_" symbols in the middle;

4. The domain name part starts with a letter or number, and there can be "-" and "_" symbols in the middle;

PHP email verification regular expression

Example

The code is as follows

代码如下	复制代码
preg_match("/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i",$email );

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代码如下

复制代码

/**  * 自己修整的一个邮箱正则表达式  * 琼台博客  */ echo ''; function c_email($email){     $reg='/^([a-zA-Z0-9]{1,20})(([_-.])?([a-zA-Z0-9]{1,20}))*@([a-zA-Z0-9]{1,20})(([-_])?([a-zA-Z0-9]{1,20}))*(.[a-z]{2,4}){1,2}$/';     if(preg_match($reg,$email))         return true;         return false; } $email = 'mail@lizhong.me'; $check_result = c_email($email); if($check_result){     echo '邮箱格式正确'; }else{     echo '邮箱格式错误'; }

preg_match("/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i", $email );

代码如下

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class Reg { public $mail; function __construct() { $this->mail = $_POST["mail"];            }     function RegMail()     {         if(preg_match("/^[0-9a-zA-Z]+(?:[_-][a-z0-9-]+)*@[a-zA-Z0-9]+(?:[-.][a-zA-Z0-9]+)*.[a-zA-Z]+$/i", $this->mail))         {             echo "";         }         else         {             echo "";         }     } } $r = new Reg(); $r->RegMail(); $strings = "abc@163.com"; if(preg_match("/^[0-9a-zA-Z]+(?:[_-][a-z0-9-]+)*@[a-zA-Z0-9]+(?:[-.][a-zA-Z0-9]+)*.[a-zA-Z]+$/i",$strings)) {     echo"验证成功！是邮箱地址。"; } else {     echo"不是邮箱地址！"; } ?>

The code is as follows

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/** * An email regular expression modified by myself * Qiongtai Blog ​*/ echo ''; function c_email($email){ $reg='/^([a-zA-Z0-9]{1,20})(([_-.])?([a-zA-Z0-9]{1,20}))*@ ([a-zA-Z0-9]{1,20})(([-_])?([a-zA-Z0-9]{1,20}))*(.[a-z]{2, 4}){1,2}$/'; If(preg_match($reg,$email))          return true;                                           Return false; } $email = 'mail@lizhong.me'; $check_result = c_email($email); if($check_result){ echo 'The email format is correct'; }else{ echo 'Email format error'; } Email verification class

The code is as follows

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class Reg<🎜> {<🎜> Public $mail;<🎜> Function __construct()<🎜> {<🎜>            $this->mail = $_POST["mail"];                                                                               } Function RegMail() { if(preg_match("/^[0-9a-zA-Z]+(?:[_-][a-z0-9-]+)*@[a-zA-Z0-9]+(?:[ -.][a-zA-Z0-9]+)*.[a-zA-Z]+$/i", $this->mail))             { echo ""; }         else             { echo ""; } } } $r = new Reg(); $r->RegMail(); $strings = "abc@163.com"; if(preg_match("/^[0-9a-zA-Z]+(?:[_-][a-z0-9-]+)*@[a-zA-Z0-9]+(?:[ -.][a-zA-Z0-9]+)*.[a-zA-Z]+$/i",$strings)) { echo "Verification successful! It's the email address."; } else { Echo "Not an email address!"; } ?> http://www.bkjia.com/PHPjc/631574.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631574.htmlTechArticleEmail verification codes are mostly unable to verify one-letter domain names or one-letter usernames, such as: i@fufuok. com or fufu@9.cn. The solution is as follows: 1. Do not judge the total length, judge the length...