[issue41605] t = re.sub(".*", "*", src) has different ouput

[soyoo]

New submission from soyoo <soyoo at aliyun.com>:

import re

src = "123"  # can be anything
t = re.sub(".*", "*", src)

"""
The output of 't' is different in python2 and python3;
When python version is python3, it's depend on OS version.

When python version is python2, it seem always output single '*'.
When python version is python3, and OS is Linux, it output single '*';
When python version is python3, and OS is Mac or windows, it output double '**'.
"""

----------
components: 2to3 (2.x to 3.x conversion tool)
files: python3 on windows.png
messages: 375741
nosy: soyoo
priority: normal
severity: normal
status: open
title: t = re.sub(".*", "*", src) has different ouput
type: behavior
versions: Python 3.7
Added file: https://bugs.python.org/file49418/python3 on windows.png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41605>
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