正则里的贪婪表达式。解决思路
正则里的贪婪表达式。。
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> $a = '<b>aaa</b><b>bbb</b><b>ccc</b>'; $pattern1 = '/<b>.*?/'; $pattern2 = '/^<b>.*?$/'; </b></b>
用$pattern1和$pattern2与$a进行匹对,第一个能匹配出'aaa'、'bbb'、'ccc'这三个
但是用$pattern2只能匹对出'aaabbbccc',也就是.*?的贪婪模式没起作用,这是为什么???
谢谢!
------解决方案--------------------
因为你加了结尾符$ 所以它就一直匹配到字符串末尾。
即使去掉了$ 也只能匹配第一个aaa,因为你加了 ^

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