DFA construction is O(2^m) in the worst case, where m is the size of the NFA. this is widely known in academic circles, but in practice, most people think well of DFAs because they are used in tools like grep that are optimized for the common case. but if you throw a large regex at them, they will blow up in size and become unusable. DFA matching is linear O(n) where n is the size of the input, and the constant is ~3-4 assembly instructions per character - faster than anything you could write by hand.
Newsletter (13)
。业内人士推荐搜狗输入法下载作为进阶阅读
print "\nechoing... ", input
Соответствующее заявление Ханьхуэй сделал на полях открывшейся в Пекине ежегодной парламентской сессии.
Eby said the government was waiting for its regional partners on the west coast, in California, Oregon, and Washington to also make the time change, but those states had to wait for congressional approval.