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The form is ready for publishing online but before you make it live, how would you ensure that candidates have entered data in the correct format?And even if the format is proper, is the data itself valid?Your organization has a few vacant positions and you are planning to use the Google Forms service to prepare a pre-interview questionnaire for job applicants.You have created a form and it has all the standard fields where candidates can enter their name, email address, website URL, phone number, zip code and other essential details.Regular expressions are very powerful tools for performing pattern matches.PERL programmers and UNIX shell programmers have enjoyed the benefits of regular expressions for years.NET applications through the Regular Expression Validator control and the Regex class in the System. You can use regular expressions to restrict the range of valid characters, to strip unwanted characters, and to perform length and format checks.You can constrain the input format by defining patterns that the input must match.

In this article I will present a brief tutorial on the basics of regular expressions and then give some examples of how they can be used to simplify data validation.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 lesson starts with the basics, and gradually builds to cover more advanced techniques. If three digits appear, it must start either 0 or 1 # e.g ([0-9], [0-9][0-9],[0-1][0-9][0-9]) | # ..2[0-4]\d # start with 2, follow by 0-4 and end with any digit (2[0-4][0-9]) | # ..25[0-5] # start with 2, follow by 5 and ends with 0-5 (25[0-5]) ) # end of group #2 \.

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The problem with this is that the default Internet URL This offers a wider support for URL’s, but there is a small gotcha that you need to be aware of. If the user adds a url without http or https then an anchor with that url applied will break because it will be calling an external url, which requires the protocol; otherwise it is handled as a relative link by your browser. Of course, I recommend you always extract your common code into reusable methods, but that’s another discussion!

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