Select faces by material?

[JESTERRRRRR]

Is there any way I can take a model, with a bunch of groups, and select only the faces that have a given material (with every face in the entire model regardless of group being checked)?

I have found several scripts, one in particular, "material_selection.rb" that almost do the job, except they check the material of a group, not the individual faces within the group, and add the entire group to the selection.

My model is made up of cubes, usually only 1 face on the cube has a texture, so I wanted to delete the other faces, but there are far too many to do it manually.

Any help greatly appreciated

[TIG]

...or to put your request another way...
How to delete faces [and any consequent unneeded edges] inside selected groups, IF they have no material...
This one liner does that...

 m=Sketchup.active_model; m.start_operation('X'); m.selection.grep(Sketchup;;Group).each{|g|g.entities.grep(Sketchup;;Face).each{|f|f.erase! unless f.material};g.entities.grep(Sketchup;;Edge).each{|e|e.erase! unless e.faces[0]} }; m.commit_operation; 

This code copy/pasted into the Ruby Console deletes all faces inside pre-selected groups, if they do not have a material assigned to them, it then removes any faceless edges. It is one step undo-able...

[JESTERRRRRR]

Thanks TIG! I will put in a good word for you if I die first.