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Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.
Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.
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.
Input validation can be implemented using any programming technique that allows effective enforcement of syntactic and semantic correctness, for example: , where the ' character is fully legitimate.
For more information on XSS filter evasion please see the XSS Filter Evasion Cheat Sheet.
In summary, input validation should: Example validating the parameter “zip” using a regular expression.
private static final Pattern zip Pattern = Pattern.compile("^\d(-\d)?
White list validation involves defining exactly what IS authorized, and by definition, everything else is not authorized.
From this day forward, you will no longer squander your time trying to work out the perfect regex to validate email addresses.
You will also never again run the risk of rejecting what is, in fact, a strange, valid email address.
Please note, email addresses should be considered to be public data.
Many web applications contain computationally expensive and inaccurate regular expressions that attempt to validate email addresses.