Regular Expression required

Hi

I have a desktop search app that supports the use of Regular Expresssions

For example I can use

Shell ("C:\Program Files\2BrightSparks\FindOnClick\FindOnClick.exe -pathregex " & Chr$(34) & "c:\\[a-j]")

To run the app and search for all files on C: that begin with a-j (pretty useless I know, but this is the example frovided)

What I am trying to do is to search files on C:\ that contain a text string of say "text" and I have not got the faintest idea of how Regular Expressions work. I don't know that this is the right place to post this either.

Thanks