[issue25054] Capturing start of line '^'

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Could anybody please make review at least of the documentation part? I want to merge this before 3.7.0a3 be released.

Initially I was going to backport the part that relates findall(), finditer() and sub(). It changes the behavior only in corner cases and I didn't expect it can break a real code. But since it broke a pattern in the doctest module, I afraid it can break a third-party code.

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<https://bugs.python.org/issue25054>
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