I don't think it is a correct regex.
At least a common practice is, that if - is used to be as a character option
itself and not as a meta, it is used as the first character in []. i.e. the
correct expression would be
r'^[a-zA-Z0-9][-a-zA-Z0-9\.]*$'
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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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