Regular Expression for one embedded space and forced upper cases?

HI!
I want to write a regular expression which may enforce input in upper case and one embedded space e.g I want to give me input as "M23 9RQ". So please help me the regular expression for this input or some other better solution like customer validator etc.
Thanks

From what you mention - then off the top of my head, I'd say something along this line:

Code:

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[A-Z]([A-Z ]+[A-Z])?

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