You can select objects or branches based on their namespaces using the Select by Namespace dialog box.
To select objects by their namespaces:
The Select by Namespace dialog box appears.
Select by Namespace dialog box
Once the search is complete, all objects with that namespace are highlighted.
To select branches by their namespaces:
Once the search is complete, all branches (such as the Scene branch, Characters branch, Control Rigs branch, Constraints branch, Material branch, Poses branch, Shaders branch, Textures branch...) with that namespace are highlighted.