Regular Expression to check a password.

I need a Regular Expression to require two upper case characters and 2 numbers in a password of 8 to 10 characters.  I have found a lot of examples for at least one number and at least one Uppercase but cant seem to find or figure out  the above.
kelley_foustAsked:
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monicaiCommented:
^(?=.*[A-Z].*[A-Z])(?=.*\d.*\d)[a-zA-Z0-9]{8,10}$

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kelley_foustAuthor Commented:
You are a life saver!  What does ?=  actually mean
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monicaiCommented:
positive lookahead assertion.  it is useful if you want to match certain characters without following any order.  repeating the regex twice will force the assertion to repeat twice.

http://www.regular-expressions.info/lookaround.html

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