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Validating email address with regular expression examples

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You have a form on your website or a dialog box in your application that asks the user for an email address. You want to use a regular expression to validate this email address before trying to send email to it.

This reduces the number of emails returned to you as undeliverable. This first solution does a very simple check. It only validates that the string contains an at sign that is preceded and followed by one or more nonwhitespace characters.

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