[issue47152] Reorganize the re module sources

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> cryptic name

In very early versions, "mark" was called register/region.
https://github.com/python/cpython/blob/v1.0.1/Modules/regexpr.h#L48-L52

If span is accessed repeatedly, it's faster than Match.span().
Maybe consider renaming it, and make it as public attribute.

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