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).
Static data is quite secure because it doesn’t provide much of an attack surface for a malicious user.
Input validation can be used to detect unauthorized input before it is processed by the application.
To check, whether the user entered correct form of data, it’s must to apply form validation in any of the form. The expression is: /^[a-z A-Z] $/ The above expression checks whether the input characters in the string is alphabet or not.
Here I am giving you the form validation codes in Java Script. These are simple meta characters which do pattern matching. If the entered characters in the field is not in lower case or upper case. When it’s about checking contact field or zip code field, one need to check whether only the number have been entered or not.
Input validation should be applied on both syntactical and semantic level.
Syntactic validation should enforce correct syntax of structured fields (e.g.