re_file_safe = re.compile(r'^[a-zA-Z0-9][a-zA-Z0-9_.:~+-]*$')
# Prefix of binary and source filenames
-_re_file_prefix = '^(?P<package>[a-z0-9][a-z0-9.+-]+)_(?P<version>[A-Za-z0-9.:~+-]+?)'
+_re_file_prefix = r'^(?P<package>[a-z0-9][a-z0-9.+-]+)_(?P<version>[A-Za-z0-9.:~+-]+?)'
# Match binary packages
# Groups: package, version, architecture, type
-re_file_binary = re.compile(_re_file_prefix + '_(?P<architecture>[a-z0-9]+)\.(?P<type>u?deb)$')
+re_file_binary = re.compile(_re_file_prefix + r'_(?P<architecture>[a-z0-9]+)\.(?P<type>u?deb)$')
+
+# Match changes files
+# Groups: package, version, suffix
+re_file_changes = re.compile(_re_file_prefix + r'_(?P<suffix>[a-zA-Z0-9+-]+)\.changes$')
# Match dsc files
# Groups: package, version