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  Eric Phetteplace writes

> You can match a string of all caps letters like "[A-Z]"

  This works if you are limited to English. But in a multilingual
  setting, you need to watch out for other uppercases, such as 
  крихель vs КРИХЕЛЬ. It then depends in the unicode implementation
  of your regex application. In Perl, for example, you would use
  [[:upper:]].


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  Cheers,

  Thomas Krichel                  http://openlib.org/home/krichel
                                              skype:thomaskrichel