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Given such qualities, it isn't a surprise that email has become a defacto tool of business for communicating with its clientele.

These days, users are expected to supply a valid email for just about everything, provided in exchange for the privilege of downloading software, learning more about the latest sales, and even for simply offering a comment to a favorite blogger's most recent entry.

Finally, the dollar-sign located at the conclusion of the component signals that the string cannot contain any additional characters following this two-to-four character alphabetical string.

validating email address asp net-27

So for example, this regular expression would validate "jason", "go49ers" and "999999", but not ".ilovespam", ":-)hi" or "%$^abc".

This second component operates exactly like the first, save for two important differences.

These easily implementable procedures will go a very long way towards eliminating future asdf's, blah's, and other invalid entries from your user database.

As a byproduct, you'll also learn a bit more about regular expressions, and PHP's regular expression and networking functions.

I'll provide the regular expression in its entirety here, and then offer a thorough explanation of its components.