Allow only wanted characters in a string?

[Ryan Stille]

What would be an elegant way to strip all but a certain set of characters from a string?  I know I want to leave alphanumerics, dashes, underscores and spaces, but anything else I want removed.  Would it be best to loop though each character and do a Find to see if that character is in my list of allowed characters?   I would think that would be slow, searching a huge list of characters, numbers, etc.

Thanks for any help.
-Ryan

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