验证邮箱格式 用户名 url 的php正则表达式

下们用到了php教程的了ereg函数来验证电子邮箱地址，用户名，url地址实例了。

把url拆分

$url = "http://www.111com.net";

$www_url = ereg("^(http://www).([[:alnum:]]+).([[:alnum:]]+)", $url, $regs);

if ($www_url) :        
     echo $regs[0];    
     print "
";
     echo $regs[1];    
     print "
";
     echo $regs[2];    
     print "
";
     echo $regs[3];    
endif;
?>

 
邮箱地址

    $s = 'm@t.ca';

    if (ereg ('([[:alpha:]]+)@([[:alpha:]]+).([[:alpha:]]{2,4})', $s, $matches))
    {
      echo "Regular expression successful. Dumping matchesn";
      var_dump ($matches);
    }
    else
    {
      echo "Regular expression unsuccessful.n";
    }

?>

邮箱地址二

        $email="a@a.com";
        $is_com = ereg("(.)(com$)", $email);
        print $is_com;
?>

用户名验证

   $username = "Test";
   if (ereg("([^a-z])",$username)) echo "Username must be all lowercase!";
?>