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I used to create a test case related a US SSN text field data validation, there is a Regex(Regexp or Regular Expression):

"^(?!000)([0-6]\d{2}|7([0-6]\d|7[012]))([ -]?)(?!00)\d\d\3(?!0000)\d{4}$"

which defined the input validation, I figured it out at the beginning, but after one month later when I look back the documentation, there is only “!@#$%%^” in my head.

And here is a very cool site (http://www.regexper.com/) could transfer the Regex to a much easier understandable graphic chart like this:
Image

Cool

Update: forgot to mention, the expression need to be in JavaScript style

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