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An Arizona sex offender was recently sentenced to 10 years in prison because of his persistent use of Facebook.He claimed that the social networking site was necessary part of the marketing strategy for his web-design business." The land of the Big Easy wants to make it very hard for sex offenders to use social networks.Credit card numbers issued by the major providers follow a standard format that makes it easy to detect them using regular expressions.The rules for valid numbers include: These guidelines are a great starting point for ruling out quite a few false positives because they can easily be adapted to a regular expression.

The Luhn algorithm verifies that a card number passes the "check digit" test, which enables error detection by identifying number patterns that are known to be invalid.This algorithm does not, of course, confirm the number corresponds to an active account, but it does provide additional confidence in your match.Social Security numbers, on the other hand, are not quite as easy to match because there is no Luhn algorithm equivalent to verify their validity.There are two basic approaches to this problem: centralised review or decentralised authority.In the centralised approach, the tools report all results to a central administrator who is responsible for validating and eradicating suspicious data.

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The algorithm works by summing all the card number digits and then performing the mod 10 operation on the sum.

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