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.
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.