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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).
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.
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.
Input validation should be applied on both syntactical and semantic level.
Input validation can be used to detect unauthorized input before it is processed by the application.
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.
Detailed information on XSS prevention here: OWASP XSS Prevention Cheat Sheet Many websites allow users to upload files, such as a profile picture or more. Many web applications do not treat email addresses correctly due to common misconceptions about what constitutes a valid address.
Specifically, it is completely valid to have an mailbox address which: At the time of writing, RFC 5321 is the current standard defining SMTP and what constitutes a valid mailbox address.