debian/lib/python/debian_linux/debian.py: Let superclass split version string

The Version class already parses the version into upstream and Debian
revision parts.  Match the results of that against two separate
regexps rather than matching the whole version string and potentially
parsing it inconsistently.

As a result we no longer have to explicitly exclude '-' in the
revision_other group.

debian/lib/python/debian_linux/debian.py

@@ -214,8 +214,7 @@ class _VersionTest(unittest.TestCase):
 
 
 class VersionLinux(Version):
-    _version_linux_rules = r"""
-^
+    _upstream_re = re.compile(r"""
 (?P<version>
     \d+\.\d+
 )
@@ -235,7 +234,9 @@ class VersionLinux(Version):
         \d+
     )
 )?
--
+$
+    """, re.X)
+    _revision_re = re.compile(r"""
 \d+
 (\.\d+)?
 (?:
@@ -251,20 +252,20 @@ class VersionLinux(Version):
     )?
     |
     (?P<revision_other>
-        [^-]+?
+        .+?
     )
 )
 (?:\+b\d+)?
 $
-"""
-    _version_linux_re = re.compile(_version_linux_rules, re.X)
+    """, re.X)
 
     def __init__(self, version):
         super(VersionLinux, self).__init__(version)
-        match = self._version_linux_re.match(version)
-        if match is None:
+        up_match = self._upstream_re.match(self.upstream)
+        rev_match = self._revision_re.match(self.revision)
+        if up_match is None or rev_match is None:
             raise RuntimeError(u"Invalid debian linux version")
-        d = match.groupdict()
+        d = up_match.groupdict()
         self.linux_modifier = d['modifier']
         self.linux_version = d['version']
         if d['modifier'] is not None:
@@ -274,10 +275,11 @@ $
             self.linux_upstream = d['version']
         self.linux_upstream_full = self.linux_upstream + d['update']
         self.linux_dfsg = d['dfsg']
-        self.linux_revision_experimental = match.group('revision_experimental') and True
-        self.linux_revision_security = match.group('revision_security') and True
-        self.linux_revision_backports = match.group('revision_backports') and True
-        self.linux_revision_other = match.group('revision_other') and True
+        d = rev_match.groupdict()
+        self.linux_revision_experimental = d['revision_experimental'] and True
+        self.linux_revision_security = d['revision_security'] and True
+        self.linux_revision_backports = d['revision_backports'] and True
+        self.linux_revision_other = d['revision_other'] and True
 
 
 class _VersionLinuxTest(unittest.TestCase):