[issue9723] Add shlex.quote

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

-_find_unsafe = re.compile(r'[^\w\d@%_\-\+=:,\./]').search
+_find_unsafe = re.compile(r'[^\w@%\-\+=:,\./]', re.ASCII).search

FWIW there are still unnecessary escapes before '+' and '.', and possibly '-' ('-' doesn't need escaping only when it's at the end (or beginning) of the regex).

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<http://bugs.python.org/issue9723>
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