it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
the result is RE#, the first general-purpose regex engine to support intersection and complement with linear-time guarantees, and also the overall fastest regex engine on a large set of benchmarks. we also wanted to address some more things along the way, like returning the correct matches (the ones you meant, leftmost-longest), when the default semantics are given by the PCRE implementation. or put another way, “it’s correct if it does whatever the one that blows up and causes denial of service does”.，这一点在WPS下载最新地址中也有详细论述
Then we have to look at the phase. There are several possible ways to efficiently implement a test on a large number of cases; I covered one in my grimoire of 8-bit Implementation Patterns. That one relied on a jump table and could hit all targets in the same amount of time. I decided not to go with that one here, because only one of our targets is really time-critical and enough are similar that we can simply do a chain of if/else statements and still be fine.。im钱包官方下载是该领域的重要参考
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