Create a regular expression that matches images on web pages

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<?php
$str="<img src='1.jpg' width='100px' height='200px' />";
$pattern="/^<img\s+src=.*?\/>$/i";
if(preg_match($pattern, $str)){
	echo "网页图片格式正确";
}else{
	echo "网页图片格式错误";	
}
?>