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Message: [QUOTE="Guest, post: 1986634"] I am using a RegularExpressionValidator to validate a TextBox. I use "^[\+|-]?[0-9]+(\.[0-9]*)?$" to check for a real number. The control works fine as long as the user enters something in the TextBox; it does not work if the user leaves the TextBox blank. Is there a bug in the implementation of the RegularExpressionValidator? The above regluar expression should also catch no entry by the user. I have added a RequiredFieldValidator to solve the problem, but it does not make sense to have two vlidators for the same textbox: a RegularExpressionValidator and a RequiredFieldValidator. Thanks. [/QUOTE]