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关于字符串用单引号和双引号的有关问题

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2016-06-13 11:12:23929browse

关于字符串用单引号和双引号的问题
$pattern_title ='/

(.*?)/iU';//定义一个正则表达式，获取某网页的标题<br>$result=file_get_contents($url);<br>preg_match_all($pattern_title,$result,$title);<br>问题是，单引号中，不是只能转移'\'和'''么，怎么还要在'/'前加个'\' <div class="tag "> <br><font color="#FF8000">------解决方案--------------------</font><br>写成这样就不用了<br>'#<title>(.*?)#iU'
明白吗？不转义的话，三个分隔符，你让php怎么识别？
------解决方案--------------------
凡是会产生歧义的都要转义
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