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; } }
转载于:https://www.cnblogs.com/vania/p/4431515.html
相关资源：java比较文件_读取输出文件_正则表达式匹配