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Regex with min characters and no spaces

Posted By:      Posted Date: October 14, 2010    Points: 0   Category :ASP.Net

Hi everyone-

How can I make this regex not accept spaces?: [0-9a-zA-Z' ']{3,}

Everything I'm reading says to put a * or a + after the [] , but I get an invalid expression error when I do.  The end result I'm looking for is a string of letters and numbers only -  no spaces inbetween.

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