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一个字串筛选问题

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Jun 23, 2016 pm 02:28 PM

本帖最后由 ruiman 于 2014-02-08 11:04:14 编辑

PHP 字符串正则表达式

才在学习PHP，现在遇到一个$contents变量里面的内容如下 document.write('

width="60" style="max-width:90%" align="absbottom"
border="0"> target="_blank">教育新闻

href="http://news.ycwb.com/2014-02/08/content_6034510.htm"
target="_blank">川大教授张兴栋当选美国国家工程院外籍院士  金羊网 06:29
href="http://news.xinhuanet.com/edu/2014-02/08/c_126099001.htm"
target="_blank">北京推一本高招计划定向投放生态涵养区  新华网 09:11
target="_blank">肇庆：主要景区迎客221万人次光明网 08:29
target="_blank">把对故乡眷恋藏心里春节后娃娃随父母出发组图  新华网 08:47
href="http://news.xinhuanet.com/edu/2014-02/08/c_119240720.htm"
target="_blank">促进高校毕业生就业有哪些新的改革举措  新华网 10:18
target="_blank">借力“适应性学习” Knewton演绎在线教育变革搜狐 09:55
href="http://www.sd.xinhuanet.com/news/2014-02/08/c_119235535.htm" target="_blank">山东为自费留学中介上紧箍
严禁到中小学招生  新华网山东频道 08:03
target="_blank">西汉“学术超男”策划“诗经秀”取功名人民网 07:04
target="_blank">李鸿章哥哥摆架子被下级痛骂人民网 07:04
target="_blank">江苏金坛教育系统工作“贴地行走”摸准基层脉中国教育新闻网 08:50

target="_blank">更多>>

');
现在想把里面的这样的内容 href="http://news.ycwb.com/2014-02/08/content_6034510.htm"
target="_blank">川大教授张兴栋当选美国国家工程院外籍院士筛几条出来，请问应如何操作。

回复讨论(解决方案)

"筛几条" 是指哪几条？这个标准怎么定义？

$str="content";preg_match_all("#<a\s*[\n|\r]\s*href=.*?target=\"_blank\">.*?</a>#is", $str, $matches);print_r($matches);

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$str="content";preg_match_all("#<a\s*[\n|\r]\s*href=.*?\s*[\n|\r]\s*target=\"_blank\">.*?</a>#i", $str, $matches);print_r($matches);

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$s =<<< TXTdocument.write('<DIV style="margin-bottom: 10px;"><A href="http://news.baidu.com/" target="_blank"><img  src="/static/imghw/default1.png"  data-src="Other%20web_files/slogo-news.gif"  class="lazy"     style="max-width:90%"  style="max-width:90%" align="absbottom"  border="0" alt="一个字串筛选问题" ></A>   <A class="blk" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">教育新闻</A></DIV><DIV class="baidu" style="width: 100%; text-align: left; table-layout: fixed; -ms-word-wrap: break-word;"><A href="http://news.ycwb.com/2014-02/08/content_6034510.htm" target="_blank">川大教授张兴栋当选美国国家工程院外籍院士 </A> <SPAN>金羊网 06:29</SPAN><BR><A href="http://news.xinhuanet.com/edu/2014-02/08/c_126099001.htm" target="_blank">北京推一本高招计划 定向投放生态涵养区 </A> <SPAN>新华网 09:11</SPAN><BR><A href="http://news.gmw.cn/newspaper/2014-02/08/content_2849438.htm" target="_blank">肇庆：主要景区迎客221万人次</A> <SPAN>光明网 08:29</SPAN><BR><A href="http://news.xinhuanet.com/edu/2014-02/08/c_126098505.htm" target="_blank">把对故乡眷恋藏心里 春节后娃娃随父母出发 组图 </A> <SPAN>新华网 08:47</SPAN><BR><A href="http://news.xinhuanet.com/edu/2014-02/08/c_119240720.htm" target="_blank">促进高校毕业生就业有哪些新的改革举措 </A> <SPAN>新华网 10:18</SPAN><BR><A href="http://learning.sohu.com/20140208/n394601900.shtml" target="_blank">借力“适应性学习” Knewton演绎在线教育变革</A> <SPAN>搜狐 09:55</SPAN><BR><A href="http://www.sd.xinhuanet.com/news/2014-02/08/c_119235535.htm" target="_blank">山东为自费留学中介上紧箍 严禁到中小学招生 </A> <SPAN>新华网山东频道 08:03</SPAN><BR><A href="http://edu.people.com.cn/n/2014/0208/c1053-24295188.html" target="_blank">西汉“学术超男”策划“诗经秀”取功名</A> <SPAN>人民网 07:04</SPAN><BR><A href="http://edu.people.com.cn/n/2014/0208/c1053-24295191.html" target="_blank">李鸿章哥哥摆架子被下级痛骂</A> <SPAN>人民网 07:04</SPAN><BR><A href="http://www.jyb.cn/basc/xw/201402/t20140208_569160.html" target="_blank">江苏金坛教育系统工作“贴地行走”摸准基层脉</A> <SPAN>中国教育新闻网 08:50</SPAN><BR><DIV style="font-size: 12px; margin-top: 5px;"><A class="more" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">更多>></A></DIV></DIV>');TXT;//全部 A 标记preg_match_all('#<a.+</a>#isU', $s, $r);print_r($r[0]);//仅文字标题的 A 标记preg_match_all('#<a[^<]+</a>#isU', $s, $r);print_r($r[0]);//仅包含指定词汇的 A 标记preg_match_all('#<a[^<]+院士.*</a>#isU', $s, $r);print_r($r[0]);

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Array(    [0] => <A href="http://news.baidu.com/" target="_blank"><img  src="/static/imghw/default1.png"  data-src="Other%20web_files/slogo-news.gif"  class="lazy"     style="max-width:90%"  style="max-width:90%" align="absbottom"  border="0" alt="一个字串筛选问题" ></A>    [1] => <A class="blk" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">教育新闻</A>    [2] => <A href="http://news.ycwb.com/2014-02/08/content_6034510.htm" target="_blank">川大教授张兴栋当选美国国家工程院外籍院士 </A>    [3] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_126099001.htm" target="_blank">北京推一本高招计划 定向投放生态涵养区 </A>    [4] => <A href="http://news.gmw.cn/newspaper/2014-02/08/content_2849438.htm" target="_blank">肇庆：主要景区迎客221万人次</A>    [5] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_126098505.htm" target="_blank">把对故乡眷恋藏心里 春节后娃娃随父母出发 组图 </A>    [6] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_119240720.htm" target="_blank">促进高校毕业生就业有哪些新的改革举措 </A>    [7] => <A href="http://learning.sohu.com/20140208/n394601900.shtml" target="_blank">借力“适应性学习” Knewton演绎在线教育变革</A>    [8] => <A href="http://www.sd.xinhuanet.com/news/2014-02/08/c_119235535.htm" target="_blank">山东为自费留学中介上紧箍 严禁到中小学招生 </A>    [9] => <A href="http://edu.people.com.cn/n/2014/0208/c1053-24295188.html" target="_blank">西汉“学术超男”策划“诗经秀”取功名</A>    [10] => <A href="http://edu.people.com.cn/n/2014/0208/c1053-24295191.html" target="_blank">李鸿章哥哥摆架子被下级痛骂</A>    [11] => <A href="http://www.jyb.cn/basc/xw/201402/t20140208_569160.html" target="_blank">江苏金坛教育系统工作“贴地行走”摸准基层脉</A>    [12] => <A class="more" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">更多>></A>)Array(    [0] => <A class="blk" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">教育新闻</A>    [1] => <A href="http://news.ycwb.com/2014-02/08/content_6034510.htm" target="_blank">川大教授张兴栋当选美国国家工程院外籍院士 </A>    [2] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_126099001.htm" target="_blank">北京推一本高招计划 定向投放生态涵养区 </A>    [3] => <A href="http://news.gmw.cn/newspaper/2014-02/08/content_2849438.htm" target="_blank">肇庆：主要景区迎客221万人次</A>    [4] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_126098505.htm" target="_blank">把对故乡眷恋藏心里 春节后娃娃随父母出发 组图 </A>    [5] => <A href="http://news.xinhuanet.com/edu/2014-02/08/c_119240720.htm" target="_blank">促进高校毕业生就业有哪些新的改革举措 </A>    [6] => <A href="http://learning.sohu.com/20140208/n394601900.shtml" target="_blank">借力“适应性学习” Knewton演绎在线教育变革</A>    [7] => <A href="http://www.sd.xinhuanet.com/news/2014-02/08/c_119235535.htm" target="_blank">山东为自费留学中介上紧箍 严禁到中小学招生 </A>    [8] => <A href="http://edu.people.com.cn/n/2014/0208/c1053-24295188.html" target="_blank">西汉“学术超男”策划“诗经秀”取功名</A>    [9] => <A href="http://edu.people.com.cn/n/2014/0208/c1053-24295191.html" target="_blank">李鸿章哥哥摆架子被下级痛骂</A>    [10] => <A href="http://www.jyb.cn/basc/xw/201402/t20140208_569160.html" target="_blank">江苏金坛教育系统工作“贴地行走”摸准基层脉</A>    [11] => <A class="more" href="http://news.baidu.com/n?cmd=1&class=edunews&pn=1" target="_blank">更多>></A>)Array(    [0] => <A href="http://news.ycwb.com/2014-02/08/content_6034510.htm" target="_blank">川大教授张兴栋当选美国国家工程院外籍院士 </A>)

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感谢版主的回答，正则表达式也看过，没想到能这么用，完全解决了我的问题，知道我的需求，大师就是大师哦

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