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If it's well structured data, like dates, social security numbers, zip codes, e-mail addresses, etc.then the developer should be able to define a very strong validation pattern, usually based on regular expressions, for validating such input.Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators[1], each of which may be compromised on their own and start sending malformed data.Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.

Syntactic validation should enforce correct syntax of structured fields (e.g.It is very difficult to validate rich content submitted by a user.For more information, please see the cheatsheet on Sanitizing HTML Markup with a Library Designed for the Job.A timeout has occured while connecting to the mail exchanger which serves the email address domain.Please try again in a few minutes: if the problem persists, then the domain for the email address can't accept email messages.

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