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There are lots of resources on the internet about how to write regular expressions, including: and the OWASP Validation Regex Repository.
If it's well structured data, like dates, social security numbers, zip codes, e-mail addresses, etc.
Syntactic validation should enforce correct syntax of structured fields (e.g.
SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.
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.
Please note, email addresses should be considered to be public data.
If you want validation to occur, you can create a validating Xml Reader instance by using the Xml Reader Settings class and the Create method.