fix(parse,hg,svn): Improve matching of user

Author: tony

libvcs/parse/hg.py

@@ -26,8 +26,8 @@
 from .base import Matcher, MatcherRegistry, URLProtocol
 
 RE_PATH = r"""
-    ((?P<user>.*)@)?
-    (?P<hostname>([^/:]+))
+    ((?P<user>\w+)@)?
+    (?P<hostname>([^/:@]+))
     (:(?P<port>\d{1,5}))?
     (?P<separator>/)?
     (?P<path>