I took a look and the conclusion is the error is just an warning issue by Python
string parsing, the regex is perfectly valid.
I don't think we need to fix this, if anyone wants to remove the
warning, please try the following;
- transform the regex string into a raw string:
r'^[a-zA-Z0-9][a-zA-Z0-9\-\.]*$'
I mark this bug Won't fix
** Changed in: postfix (Ubuntu)
Status: Confirmed => Won't Fix
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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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