PHP正则匹配img及标签各属性值（匹配图片函数）

<?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);

$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);

?>

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);

?>

<?php
$str='<h1>php php php php php php1</h1><h2>php php php php php php2</h2><h3>php php php php php php3</h3><h4>php php php php php php4</h4>';
preg_match_all("@<h([1-6])>(.*?)</h＼＼1>@",$str,$all);
print_r($all);
?>

结果
Array
(
    [0] => Array
        (
            [0] => <h1>php php php php php php1</h1>
            [1] => <h2>php php php php php php2</h2>
            [2] => <h3>php php php php php php3</h3>
            [3] => <h4>php php php php php php4</h4>
        )

    [1] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

    [2] => Array
        (
            [0] => php php php php php php1
            [1] => php php php php php php2
            [2] => php php php php php php3
            [3] => php php php php php php4
        )

)

<?php
$string = "Is is the cost of of gasoline going up up";
$pattern = "/＼b([a-z]+) ＼＼1＼b/i"; //这里的＼＼1不能使用＼$1或$1
$str = preg_replace($pattern, "＼＼1", $string); //这里的＼＼1可以使用＼$1或$1，引用第一个子匹配
echo $str; //效果是Is the cost of gasoline going up
?>

<?php
$string = "{April 15, 2003}";

//'w'匹配字母、数字和下划线，'d'匹配0-99数字，'+'匹配重复一次或更多次。
$pattern = "/{(＼w+) (＼d+), (＼d+)}/i"; //在字符串中要搜索的匹配项
$replacement1 = "＼${1}1,＼$3";
$replacement2 = "＼$0";
$replacement3 = "＼$1";
$replacement4 = "＼$2";
$replacement5 = "＼$3";
echo "<BR>";

//字符串被替换为与第n个被捕获的括号内的子模式所匹配的文本
print preg_replace($pattern, $replacement1, $string);
echo "<BR>";
print preg_replace($pattern, $replacement2, $string);
echo "<BR>";
print preg_replace($pattern, $replacement3, $string);
echo "<BR>";
print preg_replace($pattern, $replacement4, $string);
echo "<BR>";
print preg_replace($pattern, $replacement5, $string);
echo "<BR>";

//一般表现形式
print preg_replace("/＼w+/i","j",$string);
?>

效果:
April1,2003
{April 15, 2003}
April
15
2003
{j j, j}

<?php
$str='1.aadxaaa 2.bdxdxbb2bbb 3.cccc2ccc 4.dxdxdxdddddxdxdx';
preg_match_all("/(?:dx)+/",$str,$all);
print_r($all);
?>

输出：

Array
(
    [0] => Array
        (
            [0] => dx
            [1] => dxdx
            [2] => dxdxdx
            [3] => dxdxdx
        )

)