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@laike9m
Created Aug 21, 2019
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http://wiki.c2.com/?RawStrings
Raw string 是个通用概念。即 escape 不生效的 string,既然不生效,也无法 escape 掉 ending sequence。
所有语言的 raw string 都面临一个问题,即如何处理 ending sequence
Python
https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals
staring sequence: “ or '
ending sequence: “ or '
Python 的做法是允许 ‘, “ 出现,但需要用 \ escape 掉它们(相当于在 Python raw string里有唯一生效的escape就是\”和\’),并且 \ 依然会出现
C++
http://en.cppreference.com/w/cpp/language/string_literal
staring sequence: “(
ending sequence: “)
直接不允许 ending sequence 在 raw string 中出现
Go
https://golang.org/ref/spec#String_literals
staring sequence: `
ending sequence: `
类似的,也不允许 ending sequence 在 raw string 中出现
因为 raw string 本来就是在特殊情况下才有用的,比如 regex, multiline,即使有不能使用 ending sequence 的限制也无所谓。如果有这种需求用普通string就好了。
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