我们最经常遇到的验证,就是电子邮件地址验证。网站上常见。各种网页脚本也都常用“正则表达式”(regular expression)对我们输入的电子邮件地址进行验证,判断是否合法。有的还能分解出用户名和域名。现在用PHP语言实现一下电子邮件地址验证程序,用的是PHP正则表达式库。
源代码如下:
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<? php
header ( "Content-Type: text/html; charset = UTF -8" );
$ reply = "" ;
if ( isset($_POST["email_address"]) )
{
$email_address = $_POST["email_address"];
$ pattern = "/^([0-9A-Za-z\\-_\\.]+)@([0-9a-z]+\\.[a-z]{2,3}(\\.[a-z]{2})?)$/i" ;
if ( preg_match( $pattern, $email_address ) )
{
$reply = "您输入的电子邮件地址合法<br />< br />\n";
$user_name = preg_replace( $pattern ,"$1", $email_address );
$domain_name = preg_replace( $pattern ,"$2", $email_address );
$reply .= "用户名:".$user_name."< br />\n";
$reply .= "域名:".$domain_name."< br />\n\n";
}
else
{
$reply = "您输入的电子邮件地址不合法";
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
< html xmlns = "http://www.w3.org/1999/xhtml" lang = "zh" xml:lang = "zh" >
< head >
< title >电子邮件地址验证程序</ title >
</ head >
< body style = "text-align: center;" >
< h1 >电子邮件地址验证程序</ h1 >
< form action = "#" method = "post" >
请输入电子邮件地址:< input name = "email_address" type = "text" style = "width: 300px;" />< br />
< input type = "submit" value = "验证电子邮件地址" />
</ form >
<? php
echo $reply;
?>
</ body >
</ html >
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以上就是为大家分享的php邮箱地址正则表达式验证,希望对大家的学习有所帮助。