vbscript RegExp help

I am trying to write an asp(vbscript) parser for wiki-style pseudo code, and
can't get my head round regexp.
I am hoping if somebody could give me an example to work on for one, I could
sort the others.
e.g. how do you turn (from within a large string, with varying occurences)
.......[image:/mydir/pics/my portrait.jpg | A picture of me]......
into
...........
Hope this is an OK place to ask
Thanks, Giles