allow running testids which contain :: in the parametrized portion

changelog/9642.bugfix.rst

@@ -0,0 +1 @@
+Fix running tests by id with ``::`` in the parametrize portion.

src/_pytest/main.py

@@ -870,7 +870,10 @@ def resolve_collection_argument(
     If the path doesn't exist, raise UsageError.
     If the path is a directory and selection parts are present, raise UsageError.
     """
-    strpath, *parts = str(arg).split("::")
+    base, squacket, rest = str(arg).partition("[")
+    strpath, *parts = base.split("::")
+    if parts:
+        parts[-1] = f"{parts[-1]}{squacket}{rest}"
     if as_pypath:
         strpath = search_pypath(strpath)
     fspath = invocation_path / strpath

testing/test_main.py

@@ -171,6 +171,12 @@ def test_pypath(self, invocation_path: Path) -> None:
                 invocation_path, "pkg::foo::bar", as_pypath=True
             )
 
+    def test_parametrized_name_with_colons(self, invocation_path: Path) -> None:
+        ret = resolve_collection_argument(
+            invocation_path, "src/pkg/test.py::test[a::b]"
+        )
+        assert ret == (invocation_path / "src/pkg/test.py", ["test[a::b]"])
+
     def test_does_not_exist(self, invocation_path: Path) -> None:
         """Given a file/module that does not exist raises UsageError."""
         with pytest.raises(