正则里的贪婪表达式。。
PHP code
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$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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