On Tue, May 26, 2009 at 09:45:25AM -0700, mmayer344 wrote:
>
> 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
Try this:
\bun\b|\bu\.\s*n\.|\bunited\s+\+?nation
\b matches on a word-boundary, i.e. the position between a word character
[a-zA-Z0-9_] and a non-word character [^a-zA-Z0-9_].
Ronald
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