.NET Social Security Number Validation

Writing code for work on a Sunday is certainly not my idea of a good time. Especially when our approaching deadline is inspiring panic and all manner of apocalyptic pronouncements about bits of code that aren’t working.

The latest panic compelled me to do a bit of research (i.e. Googling) to find out what constituted a valid Social Security number. Google kindly coughed up this Wikipedia entry. A quick scan through the article yielded this page from the Social Security Administration. Titled Social Security Number Allocations, it lists the valid code ranges for all 50 states, DC, and U.S. territories.

The regular expression you get from Microsoft’s web user control for SSN validation is relatively simple: d{3}-d{2}-d{4}. One of the developers changed things to use this: ^(?!000)([0-6]d{2}|7([0-6]d|7[012]))([ -]?)(?!00)dd3(?!0000)d{4}$

Sure, it’s gold plating. But it works. It would be more trouble to take out than it was worth anyway.

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