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To validate a server control's input using a Regular Expression Validator The regular expression used in the preceding code example constrains an input name field to alphabetic characters (lowercase and uppercase), space characters, the single quotation mark (or apostrophe) for names such as O'Dell, and the period or dot character.In addition, the field length is constrained to 40 characters.To validate other forms of input, such as query strings, cookies, and HTML control input, you can use the System. The attacker can then supply carefully crafted input that compromises your application by attempting SQL injection, cross-site scripting, and other injection attacks.To avoid such vulnerability, you should validate text fields (such as names, addresses, tax identification numbers, and so on) and use regular expressions to do the following: Regular expression support is available to ASP. If you capture input by using server controls, you can use the Regular Expression Validator control to validate that input.This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.
We will also add a Text Box to validate, as well as a button to submit the form with.Now you will see the browser posting back to the server, but the result will be the same - the validator still works!