$"); public void do Post( Http Servlet Request request, Http Servlet Response response) Be aware that any Java Script input validation performed on the client can be bypassed by an attacker that disables Java Script or uses a Web Proxy.
If the input field comes from a fixed set of options, like a drop down list or radio buttons, then the input needs to match exactly one of the values offered to the user in the first place.
Free-form text, especially with Unicode characters, is perceived as difficult to validate due to a relatively large space of characters that need to be whitelisted.
But while it provides more privacy than most systems, it's not going to replace lying...
Every enterprise needs to establish a plan of action to assess and then recover from unauthorized access to its network.
SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.
start date is before end date, price is within expected range).
In summary, input validation should: Example validating the parameter “zip” using a regular expression.
private static final Pattern zip Pattern = Pattern.compile("^\d(-\d)?
Please note, email addresses should be considered to be public data.