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 > |
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。