RE# supports lookarounds of the form (?<=R1)R2(?=R3), where R1/R2/R3 are regexes without lookarounds. this is a very common pattern in the wild, and it covers a lot of use cases.
The primary use cases I’ve seen implemented or promoted so far include:，更多细节参见PDF资料
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Author(s): Shin-Pon Ju, Dong-Yeh Wu, Chun-Wen Cheng, Hsing-Yin Chen
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