PHP正则提取或替换img标记属性

PHP正则提取或更改图片img标记中的任意属性';
 
//1、取整个图片代码
preg_match('/]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i',$str,$match);
echo $match[0];
 
//2、取width
preg_match('//i',$str,$match);
echo $match[1];
 
//3、取height
preg_match('//i',$str,$match);
echo $match[1];
 
//4、取src
preg_match('//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('/()/i',"${1}uc/images/${3}",$str);
echo "
";
 
//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('/(/i',"${1} ${2}uc/images/${3}>",$str);
 
 
 
?>