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I'm using a MaskedTextBox to limit input to word characters and a few extra characters. The mask must allow all international letter or word characters. My mask is [\w/ \-]{0,129}, which works just fine using the standard .NET Regex class, but does not work with the regex parser the MaskedTextBox uses. Is there a way to force the control to use the .NET built in class or am I going to need to resort to a negative mask for all the possible characters I don't want to allow?