V8 引擎开始尝试优化正则引擎

[xxleyi]

An additional non-backtracking RegExp engine · V8

有点意思哈，正好最近对正则有了更全面的认识，看到这篇博客，能够 get 到一些东西，尤其是 non-backtracking-regexp 的限制：

• not contain backreferences,
• not contain lookaheads or lookbehinds,
• not contain large or deeply nested finite repetitions, as in e.g. /a{200,500}/, and
• not have the u (Unicode) or i (case insensitive) flags set.