PHP中使用正则表达式的问题
今天看PHP的正则表达式，其中有一个PCRE模式。我的意思是，正则表达式还有各种不同的模式？
比如在某种情况下点号代码A，但是在另外一种情况下点号就代表B么？
那么现在主流的正则表达式模式是什么呢？
回复内容：
今天看PHP的正则表达式，其中有一个PCRE模式。我的意思是，正则表达式还有各种不同的模式？
比如在某种情况下点号代码A，但是在另外一种情况下点号就代表B么？
那么现在主流的正则表达式模式是什么呢？
主要就是PCRE和POSIX两种，根据环境来定，基本思路是一样的，只是一些细节不同，有不了解的地方，看看PHP帮助文档里的对应说明就行了。
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