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These two patches are not logically relative, but the next patch is based on this one. This patch of the regex scanner(or lexer) supports all styles specified by N3376. It shall build an abstract layer of regex token sequence, so that, ideally, the parser and executor do not need to care which style they are handling. Originally _Scanner is a class in regex_compiler.{h,tcc}. Since it could be a standlone module, I move it to regex_scanner.{h,tcc}. I try my best to reduce duplicated code and make the logic clear(_M_escape_map and _M_spec_char help a lot). However, I'm still worrying about potential unexpected behaviors, because it's not about correctness, but about reading standards. More testcases are welcome! Thanks! PS: For personal reasons, I probably cannot make a response in several days, but I'll try my best ;) -- Tim Shen
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