Hi folks,

I'm running through some logs of search queries, trying to pull out
the ones containing variations on United Nations. I am trying to write
a regular expression that can match a two letter format (such as "UN",
"U.N." or "U. N.") or a two word format ("United Nations", "united
+nation").

So far my flailing attempts have been able to match all of the above,
but they are also yielding any other word beginning with "un".

I want to match these:

un
u.n.
u. n.
united nation
united +nation

....but not these:

united states
UNDP
unsuccessful


Any help would be much appreciated. The log files are rather large so
if possible I'd prefer a solution that works in one pass.

Thanks,
Marcy

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