Filtering data from external text file.

[Anonymous]

Hi gurus et al.
I am working on an object meant for importing data from a total station giving me a text file containing x,y,z value plus a alphanumeric code.
I would like to be able to turn certain points on/off according to their code. In order to do this I need to filter the data. How can this be done?
Example:
wall,0,0,0
wall,0,10,0
beam,10,0,20
wall,20,0,0
beam,30,0,20.

In my object I would like to be able to turn all the wall points on making them generate a hotspot (or 3D flag).
Any ideas will be welcome and received with great gratitude

Best regards from Copenhagen

Nicolaj Hvid