PHP正则表达式去除空行与回车换行

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

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;
}

$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);

?>

<?php

 
$ext = 'jpg|jpeg|gif|bmp|png';//罗列图片后缀从而实现多扩展名匹配
$str = '<p><img title="湛蓝天空" alt="湛蓝天空" onload="ResizeImage(this,860)" src="http://你的域名/uploads/allimg/131121/1-1311210925190-L.jpg" /></p><p><img title="湛蓝天空" alt="湛蓝天空" onload="ResizeImage(this,860)" src="http://你的域名/uploads/allimg/130814/1-130Q42211190-L.jpg" /></p><p><img title="湛蓝天空" alt="湛蓝天空" onload="ResizeImage(this,860)" src="http://你的域名/uploads/allimg/130923/1-130923233I30-L.jpg" /></p>';
 
 
$img_list = array(); //这里存放结果map
$img_list = img_match($str,$ext);
print_r($img_list); //查看结果变量
 
/*
* $str，要进行处理的内容
* $ext，要匹配的扩展名
*/
 
function img_match($str,$ext){
 
$list = array(); //这里存放结果map
$c1 = preg_match_all('/<imgs.*?>/', $str, $m1); //先取出所有img标签文本
for($i=0; $i<$c1; $i++) {    //对所有的img标签进行取属性
$c2 = preg_match_all('/(w+)s*=s*(?:(?:(["'])(.*?)(?=2))|([^/s]*))/', $m1[0][$i], $m2); //匹配出所有的属性
for($j=0; $j<$c2; $j++) { //将匹配完的结果进行结构重组
$list[$i][$m2[1][$j]] = !empty($m2[4][$j]) ? $m2[4][$j] : $m2[3][$j];
}
}
 
return $list;
}
 
?>

$str = preg_match_all('/(original-title=).*?(>)/is', $str,$array);

preg_replace('[(/*)+.+(*/)]', '', $val);

$jobname="行政办—RH021001前台秘书(职位编号：RH021001)";
$jobname=preg_replace("/(.*)/","",$jobname);
$jobname=preg_replace("/.*—.*01/","",$jobname);
//输出：前台秘书

$str="<a href="space.php?uid=109">fsb</a>";s<a href="space.php?uid=109&do=thread&id=174">注意调节心态 预防职场心理疲劳</a>";
 
$str=preg_replace("/space.php?uid=(d+)&do=thread&id=(d+)/","/space-0-do-thread-id-${2}.html",$str);
$str=preg_replace("/space.php?uid=(d+)/","/space-${1}.html",$str);
 
//输出：<a href="space.php?uid=109">fsb</a>";s<a href="/space-0-do-thread-id-174.html">注意调节心态 预防职场心理疲劳</a>

<?php

/*PHP正则提取图片img标记中的任意属性*/
$str = '<center><img src="/uploads/images/20100516000.jpg" height="120" width="120"><br />PHP正则提取或更改图片img标记中的任意属性</center>';

//1、取整个图片代码
preg_match('/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i',$str,$match);
echo $match[0];

//2、取width
preg_match('/<img.+(width="?d*"?).+>/i',$str,$match);
echo $match[1];

//3、取height
preg_match('/<img.+(height="?d*"?).+>/i',$str,$match);
echo $match[1];

//4、取src
preg_match('/<img.+src="?(.+.(jpg|gif|bmp|bnp|png))"?.+>/i',$str,$match);
echo $match[1];

/*PHP正则替换图片img标记中的任意属性*/
//1、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg")
print preg_replace('/(<img.+src="?.+)(images/)(.+.(jpg|gif|bmp|bnp|png)"?.+>)/i',"${1}uc/images/${3}",$str);
echo "<hr/>";

//2、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg",并省去宽和高
print preg_replace('/(<img).+(src="?.+)images/(.+.(jpg|gif|bmp|bnp|png)"?).+>/i',"${1} ${2}uc/images/${3}>",$str);

?>