Add Match.regs (#2819)

stdlib/2/_sre.pyi

@@ -21,6 +21,8 @@ class SRE_Match(object):
     def groups(self) -> Tuple[Optional[str], ...]: ...
     def span(self) -> Tuple[int, int]:
         raise IndexError()
+    @property
+    def regs(self) -> Tuple[Tuple[int, int], ...]: ...  # undocumented
 
 class SRE_Scanner(object):
     pattern: str

stdlib/2/typing.pyi

@@ -404,6 +404,8 @@ class Match(Generic[AnyStr]):
     def start(self, group: Union[int, str] = ...) -> int: ...
     def end(self, group: Union[int, str] = ...) -> int: ...
     def span(self, group: Union[int, str] = ...) -> Tuple[int, int]: ...
+    @property
+    def regs(self) -> Tuple[Tuple[int, int], ...]: ...  # undocumented
 
 # We need a second TypeVar with the same definition as AnyStr, because
 # Pattern is generic over AnyStr (determining the type of its .pattern