Regex Help - Greedy vs. Non-Greedy

[Drew Tomlinson]

I'm trying to do a search and replace in vim.  I have lines like this:
http://site1/dir/;
http://site2/dir/;LastName, FirstName;Phone;
http://site3/dir/;LastName, FirstName;
http://site4/dir/;

I'm want to match "http:*" and stop matching at the first ";".  My basic 
regex is:

/http:.\+;/

But it's matching *all* the semi-colons.  Thus I've Googled and tried 
various incatations to try and make my regex "non-greedy" but I can't 
seem to come up with the correct combination.

How can I write a regex that stops matching at the first semi-colon?

Thanks,

Drew

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