fix(parse,git): Improve user matching

Author: tony

libvcs/parse/base.py

@@ -131,8 +131,9 @@ def register(self, cls: Matcher) -> None:
         >>> GitURLWithPip(url="git+ssh://git@github.com/tony/AlgoXY.git")
         GitURLWithPip(url=git+ssh://git@github.com/tony/AlgoXY.git,
             scheme=git+ssh,
-            hostname=git@github.com,
+            hostname=github.com,
             path=tony/AlgoXY,
+            user=git,
             suffix=.git,
             matcher=pip-url)
         """  # NOQA: E501

libvcs/parse/git.py

@@ -29,7 +29,7 @@
 # We modified it to have groupings
 SCP_REGEX = r"""
     # Optional user, e.g. 'git@'
-    (?P<user>(\w+))?@
+    ((?P<user>\w+)@)?
     # Server, e.g. 'github.com'.
     (?P<hostname>([^/:]+)):
     # The server-side path. e.g. 'user/project.git'. Must start with an
@@ -39,6 +39,7 @@
     """
 
 RE_PATH = r"""
+    ((?P<user>\w+)@)?
     (?P<hostname>([^/:]+))
     (:(?P<port>\d{1,5}))?
     (?P<separator>[:,/])?