troubleshooting Question

Regular expression: Find long words

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webressursFlag for Norway asked on
Regular ExpressionsASP.NET
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I have searched for a regex that check for long words in a text string. The text sting can be long, but any words in this string should not be longer than 20 characters. I have tried a lot of  different expressions, but all gives me the exeption even if no word is longer thean 20 chars (the total text is longer than 20 chars). I am using c#. Please see attached code.
I Have tried these expressions without luck:

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