Regex to find case differences

Assuming I have a list of names:

John.Smith            John.Smith

Joe.Blow                Joe.blow

Sarah.Smith           sarah.smith

So in the above list, I need to find Joe.Blow and Sarah.Smith, since the case (and or spelling) is different on the 2nd part of the line.

I couldn't come up with a way (assuming %s or Match or something) that would allow me to:

1.  For each line

2.  Grab the first text (^\S\+)

3.  Check the rest of the line to find a match (or better yet NOT match) using CaSe

I tried something like:

%s/^\(\S\+\)\s\+\=eval(submatch(1))

But I believe you can only use submatch() in the replacement part of the :substitute

Perhaps a :g might do it.

Vim 7.4.1-622

Any suggestions?

TIA,

David

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