function is_email($str){ 
//检验email 
return preg_match("/^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$/", $str); 
} 
function is_url($str){ 
//检验网址 
return preg_match("/^http://[A-Za-z0-9]+.[A-Za-z0-9]+[/=?%-&_~`@[]':+!]*([^<>"]) 
*$/", $str); 
} 
function is_qq($str){ 
//检验qq 
return preg_match("/^[1-9]d{4,8}$/", $str); 
} 
function is_zip($str){ 
//检验邮编 
return preg_match("/^[1-9]d{5}$/", $str); 
} 
function is_idcard($str){ 
//检验身份证 
return preg_match("/^d{15}(d{2}[A-Za-z0-9])?$/", $str); 
} 
function is_chinese($str){ 
检验是否是中文 
return ereg("^[".chr(0xa1)."-".chr(0xff)."]+$",$str); 
} 
function is_english($str){ 
//检验是否是英文 
return preg_match("/^[A-Za-z]+$/", $str); 
} 
function is_mobile($str){ 
//检验是否是手机 
return preg_match("/^(((d{3}))|(d{3}-))?13d{9}$/", $str); 
} 
function is_phone($str){ 
//建云那是否是电话 
return preg_match("/^(((d{3}))|(d{3}-))?((0d{2,3})|0d{2,3}-)?[1-9]d{6,7}$/", 
$str); 
} 
function is_safe($str){ 
return (preg_match("/^(([A-Z]*|[a-z]*|d*|[-_~!@#$%^&*.()[]{}<>?\/'"]*)|. 
{0,5})$|s/", $str) != 0); 
} 
} 

nth($subject) {
$pattern='/^0?([1-9])$|^(1[0-2])$/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Day($subject) {
$pattern='/^(d{4})-(0?d{1}|1[0-2])-(0?d{1}|[12]d{1}|3[01])$/';
return Regex::PublicMethod($pattern, $subject);
}

public static function DateTime($subject) {
$pattern='/^(d{4})-(0?d{1}|1[0-2])-(0?d{1}|[12]d{1}|3[01])s(0d{1}|1d{1}|2[0-3]):[0-5]d{1}:([0-5]d{1})$/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Email($subject) {
$pattern='/w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Postcode($subject) {
$pattern='/[1-9]d{5}(?!d)/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Photo($subject) {
$pattern='/b(([w-]+://?|www[.])[^s()<>]+(?:([wd]+)|([^[:punct:]s]|/)))/';
return Regex::PublicMethod($pattern, $subject);
}

public static function UrlAddress($subject) {
$pattern='/b(([w-]+://?|www[.])[^s()<>]+(?:([wd]+)|([^[:punct:]s]|/)))/';
return Regex::PublicMethod($pattern, $subject);
}

public static function EffectiveHttp($subject) {
$pattern='/b(([w-]+://?|www[.])[^s()<>]+(?:([wd]+)|([^[:punct:]s]|/)))/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Identity($subject) {
$pattern='/(^d{15}$)|(^d{17}([0-9]|X)$)/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Ipv4($subject) {
$pattern='/^(((d{1,2})|(1d{2})|(2[0-4]d)|(25[0-5])).){3}((d{1,2})|(1d{2})|(2[0-4]d)|(25[0-5]))$/';
return Regex::PublicMethod($pattern, $subject);
}

public static function Ipv6($subject) {
$pattern='/^([da-fA-F]{1,4}:){7}[da-fA-F]{1,4}$/';
return Regex::PublicMethod($pattern, $subject);
}

public static function PublicMethod($pattern, $subject){
if(preg_match($pattern, $subject)){
return true;
}
return false;
}
}