Фото: Brendan McDermid / Reuters
this is a very powerful technique, and it is the main reason why we are so fast on the benchmarks, because by the time we confirm a match, both the lookbehind and lookahead have already been matched - we report matches retroactively once all the context is known, instead of trying to look into the future or backtracking to the past or keeping track of NFA states. this is a very different way of thinking about regex matching, and it took me a while to wrap my head around it, but once you see it in action, i hope you appreciate how elegant and efficient it is.
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a big goal of our paper was to really highlight how useful these operators really are. making it fast was more of a side-goal, so there would be less to complain about, as there was already a lot of disbelief, and we got comments such as it being a “theoretical curiosity”. i spent over a year experimenting with different approaches (there’s an initial draft on arXiv from 2023 where lookarounds had much worse complexity), but finally we found a combination that works extremely well in practice, and it helped me find a deeper intuition for what works both in theory and in the real world.
use code MAX4KFTV
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Now, as for the newest members of the MacBook Pro family, the 14-inch M5 Pro starts at $2,199, which is $200 more than its M4 Pro predecessor, and comes with a 15-core CPU and a 16-core GPU. The 16-inch M5 Pro starts at $2,699, also $200 more than its M4 Pro predecessor, and comes with an 18-core CPU and a 20-core GPU. Both the 14-inch and 16-inch MacBook Pro M5 Pros come with 24GB of RAM and 1TB of storage in their base models.