Web Forms :: Inserting Text In A Textbox Before Calling Regexvalidator?

Jan 7, 2011

My form has a RegularExpressionValidator that validates user input in a textbox, like so:

[Code]....

Suppose that the regular expression I want to validate is the standard U.S. Social Security Number which is the following: ^d{3}-d{2}-d{4}$

Now, in order for user input to be valid, it MUST have the two dashes. Therefore, 123-45-6789] would be valid, but 123456789 would not. Well, if the user types in a nine-digit number (in other words, if the following regular expression is valid: ^d{9}$ ), then it's pretty obvious that this is a valid SSN and I want to have dashes get automatically inserted into the textbox before validation of the main regular expression begins. I don't want the user thinking "Hmmm... I don't know if I need the dashes or not." Just put them there if the user didn't type them in, then try to validate. How do I do this?

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