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正则里的贪婪表达式。解决思路
- WBOYOriginal
- 2016-06-13 10:08:06821browse
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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