正则的各种读取方式

读取数字

$pattern = "/\d+/";
$strs="23345swwyuiopbfASWEDD4667";
preg_match_all($pattern,$strs,$arr);
$arr=implode($arr[0]);
print_r($arr);

读取图片

$pic="fsafasdf<img height='200' src='images/gg.gif' width='20' />werwer <IMG height='200' src='images/cc.gif' width='20' />";
//$pattern="/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpg]))[\'|\"].*?[\/]>/i";	
$pattern='/<img.*?src=[\'|\"](.*?(?:[\.gif|\.jpg]))[\'|\"].*?[\/]?>/i';
preg_match_all($pattern,$pic,$imgList);
print_r($imgList);

 读取字符和数字

$pattern='/\w+/';
$strs="23345sw你好呀wyuiopbfASWEDD4667";
preg_match_all($pattern,$strs,$arr);
$arr=implode($arr[0]);
print_r($arr);

清除html

$strs="<a href='sd'>hello work</a> welcome <table><tr><td>good</td></tr></table>";
$html = preg_replace('/<[a-zA-Z]+[^>].*?>/i','',$strs);
$html = preg_replace("/<[\/][a-zA-Z ]+>/",'\1',$html);

　　

　　

用函数取图片

$str = '</head><body><IMG src="/afasd/sadfas11d/ok.jpg" alt="" /><IMG src="/afasd/sadfas22d/ok.jpg" alt="" /><img src="/afasd/sadf33asd/ok.jpg" alt=""></body></html>';
echo getImgUrl($str);



/**
 *  取出图片的URL
 *  getImgUrl
 *  $str 要查询的字符串
 *  $num 要取第几张图片的 URL
 *  @return String
* */
function getImgUrl($str,$num = 1)
{
	$reg = '/<img(.*?)src=(.*?)\/?>/i';
	preg_match_all($reg,$str,$imgList);

	if(!empty($imgList))
	{
		if(isset($imgList[0][$num-1]))
		{
			$img = $imgList[0][$num-1];
			preg_match('/src=(.*?)\.\w{3,4}/i',$img,$url);
			$rep = array('src="',"src='",'src=');
			if(!empty($url))
				return str_replace($rep,'',$url[0]);
			else
				return '';
		}
		else
			return '没有那么多图片';
	}
	else
		return '内容中没有图片';
}

获取图片

$text = 'adfsp<img src="abc.jpg">qwqwe<img src="img/ab333.jpg" height="40">werewr <img width="100" src="abc333.jpg">wer';
$matches1 = getImgUrl ( $text, 2 );
print_r ( $matches1 );

/**
 * 获取图片地址
 */
function getImgUrl($str, $num = 1) {
	$pattern = "/<img.*?src=[\'|\"](.*?)[\'|\"].*?\/?>/i";
	preg_match_all ( $pattern, $str, $matches );
	if (! empty ( $matches [1] [$num] )) {
		return $matches [1] [$num];
	} else {
		return false;
	}
}

 

　

　　

　　

posted on 2015-04-16 11:19  小V_chen  阅读(301)  评论(0)    收藏  举报

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