VimDIFF - ONLY on the first field of two files ?

People,

I live in vim and therefore use vimdiff most of the time for my needs
but I have a use case where I only want to diff on the FIRST field of
two files ie the files have lines that look like:

[dir|file]name | [D|F] | mtime

and I need to be able to have vimdiff only working on the [dir|file]name
and ignore the rest of the line - is this possible somehow?

Thanks,

Phil.
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Philip Rhoades

PO Box 896
Cowra NSW 2794
Australia
E-mail: phil@pricom.com.au

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