服务器与客户端的邮箱地址验证函数

function isEmail(email) {
    return /^((([a-z]|d|[!#$%&'*+-/=?^_`{|}~]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])+(.([a-z]|d|[!#$%&'*+-/=?^_`{|}~]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])+)*)|((x22)((((x20|x09)*(x0dx0a))?(x20|x09)+)?(([x01-x08x0bx0cx0e-x1fx7f]|x21|[x23-x5b]|[x5d-x7e]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(\([x01-x09x0bx0cx0d-x7f]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))))*(((x20|x09)*(x0dx0a))?(x20|x09)+)?(x22)))@((([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))).)+(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])))$/i.test(email);
}

或

function validateEmail(elementValue)
{   
var emailPattern = /^[a-zA-Z0-9._]+[a-zA-Z0-9]+@[a-zA-Z0-9]+.[a-zA-Z]{2,4}$/;   
return emailPattern.test(elementValue);
}

function checkEmail(mail) {   
return /^[w-]+(.[w-]+)*@([a-z0-9-]+(.[a-z0-9-]+)*?.[a-z]{2,6}|(d{1,3}.){3}d{1,3})(:d{4})?$/.test(mail);
}

 
if (isEmail('youremail@yourdomain.com')){ console.log(' www.111cn.net This is email is valid'); }View Code 

$a='/([w._]{2,10})@(w{1,}).([a-z]{2,4})/';
$b='1412424545645454545454545k@qq.com';

if(preg_match($a,$b)){
 echo "电子邮件合法";
}else{
 echo "电子邮件不合法啊";
}

<?php
$str = " This line　 containstliberal rn use of　　 whitespace.nn";
// First remove the leading/trailing whitespace
//去掉开始和结束的空白  www.111cn.net
$str = trim($str);
// Now remove any doubled-up whitespace
//去掉跟随别的挤在一块的空白
$str = preg_replace('/s(?=s)/', '', $str);
// Finally, replace any non-space whitespace, with a space
//最后，去掉非space 的空白，用一个空格代替
$str = preg_replace('/[nrt]/', ' ', $str);
// Echo out: 'This line contains liberal use of whitespace.'
echo "<pre>{$str}</pre>";
?>

//1、使用str_replace 来替换换行
$str = str_replace(array("rn", "r", "n"), "", $str);

//2、使用正则替换
$str = preg_replace('//s*/', '', $str);

//3、使用php定义好的变量 （建议使用）
$str = str_replace(PHP_EOL, '', $str);

    <?php  
     //php 不同系统的换行 
    //不同系统之间换行的实现是不一样的 
    //linux 与unix中用 /n 
    //MAC 用 /r 
    //window 为了体现与linux不同 则是 /r/n 
    //所以在不同平台上 实现方法就不一样 
    //php 有三种方法来解决 
         
    //1、使用str_replace 来替换换行 
    $str = str_replace(array("/r/n", "/r", "/n"), "", $str);  
         
    //2、使用正则替换 
    $str = preg_replace('//s*/', '', $str); 
         
    //3、使用php定义好的变量 （建议使用） 
    $str = str_replace(PHP_EOL, '', $str);  
    ?> 

function repalceTA($str){
    preg_match_all("/<img(.*)(src="[^"]+")[^>]+>/isU", $str, $arr);
    for($i=0,$j=count($arr[0]); $i<$j; $i++){
        $str = str_replace($arr[0][$i],"<img " .$arr[2][$i]." />",$str);
    }
    return $str;
}

$newhtml=preg_replace("/(r?n)\1+/","\1",$newhtml)；

echo preg_replace('/($s*$)|(^s*^)/m', '', $str); 完美解决:victory:

$a = 'gdgdga

gagda
faf

fefe

fefe';

echo preg_replace('/(r?n)\1+/',"nn",$a);

function DeleteHtml($str)
{
$str = str_replace("<br/>","",$str);
$str = str_replace("\t","",$str);
$str = str_replace("\r\n","",$str);
$str = str_replace("\r","",$str);
$str = str_replace("\n","",$str);
return trim($str);
}

$a="test,admin,abc";

$b="te";

$exist=preg_match("/b{$b}b/",$a);

if($exist)

{

echo "存在";

}else

{
echo "不存在";
}

<?php

$a = "abcdefgabcdefaaag";

preg_match('|abc([a-z]+)g|isu',$a,$out1);

preg_match_all('|abc([s]+)g|isu',$a,$out2);

echo "<pre>";

print_r($out1);

print_r($out2);

echo "</pre>";

?>

<?php

preg_match_all("/href="(.*)"/isu",$contents,$out);

preg_match_all('|href="(.*)"|isu',$contents,$out);

?>