See e.g. here:
https://docs.python.org/3/library/re.html
[]
Used to indicate a set of characters. In a set:
...
Ranges of characters can be indicated by giving two characters and
separating them by a '-', for example [a-z] will match any lowercase
ASCII letter, [0-5][0-9] will match all the two-digits numbers from 00
to 59, and [0-9A-Fa-f] will match any hexadecimal digit. If - is escaped
(e.g. [a\-z]) or if it’s placed as the first or last character (e.g.
[-a] or [a-]), it will match a literal '-'.
Note: It says, \- is correct syntax. But probably (should be tested)
only if within a range like [a\-z], but not this [a-z\-\.]
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https://bugs.launchpad.net/bugs/2139313
Title:
/usr/share/apport/package-hooks/postfix.py:36: SyntaxWarning: invalid
escape sequence '\-'
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