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Jsp validating text box

There are lots of resources on the internet about how to write regular expressions, including: and the OWASP Validation Regex Repository.

SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.Input validation can be used to detect unauthorized input before it is processed by the application.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.The following Javascript uses the test() method tests for a match in a string.This method returns true if it finds a match, otherwise it returns false.Ensure that any input validation performed on the client is also performed on the server.

It is very difficult to validate rich content submitted by a user.

White list validation involves defining exactly what IS authorized, and by definition, everything else is not authorized.

If it's well structured data, like dates, social security numbers, zip codes, e-mail addresses, etc.

This is very helpful when testing for Username, password, dollar amounts, etc.

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.

then the developer should be able to define a very strong validation pattern, usually based on regular expressions, for validating such input.