Validating email format

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Next, the code parses out the phone number and the extension. The phone system is such that you can't have a 1 as the first number of either an area code or a phone number prefix.

You will then either have a ten-digit phone number or a seven-digit phone number.

While we won't deal with international (non-US) phone numbers here, you can apply these techniques to your local phone number format.

In the United States, there are a number of valid formats for phone numbers that might be entered into a form: There are many other variations of this, as well, but those examples should be enough to give you an idea of what we're dealing with here.

He joined the Information Strategies team in September 1997 and is now an independent consultant.

In this 10-Minute Solution, you'll learn how to validate and format a phone number.

If you don't have either one, you have an error and bail out immediately.

For seven-digit phone numbers, we prepend the default area code, and then build the final number with a little bit of string manipulation.

The computer is now smart enough to automatically translate data into the format that has been pre-selected for use in that system, saving time—and no doubt—money.

Eric Smith has been a senior consultant with Andersen Consulting, specializing in client/server development using Oracle and Visual Basic, and was senior content developer (Visual Basic) at before it was purchased by Fawcette Technical Publications.

We’ve learned how to use the Constraint Validation API to enhance the native browser validation process for a better overall user experience.

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