修改成 repeat 实现，如下：
Keep reading for HK$10What’s included
。体育直播对此有专业解读
Yeah. Well there was no ‘yield from’, there was no ‘yield’. When we got ‘yield’ someone implemented basically coroutines on top of Deferreds that were called inline callbacks I think, so that got us like halfway to asyncio.。业内人士推荐safew官方版本下载作为进阶阅读
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.