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用Pike's VM实现的非回溯正则表达式引擎
source link: http://maskray.me/blog/2012-11-05-regex-engine
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用Pike's VM实现的非回溯正则表达式引擎
Parser之外的部分参考http://swtch.com/~rsc/regexp/regexp2.html ，代码都模仿自http://code.google.com/p/re1/source/browse 。注意到正则表达式是operator-precedence grammar，可以用一个扩展的Shunting-Yard算法来解析，其中用了一些特殊构造处理后缀操作符和括号。
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