Email validating in c

Data collection on the Internet is one of its most important features, so you must make sure that the data you collect has value and meaning.

You ensure this by eliminating any chance that the information collected does not abide by the rules you outline. NET don't know the difference between client-side and server-side validation.

Validation server controls are a series of controls that help you validate the data that the user enters into the other controls that are provided with ASP. They determine whether the form can be processed based upon the rules that you define in the validation server controls.

One of the most common elements of Web pages is a form in which the user can input data that is posted back to the server.

The bad thing about server-side validation is that it requires trips back and forth to the server.

This takes a lot of resources and makes for a slower-paced form for the user.

NET, you might have been introduced to a number of different types of controls, whether HTML server controls or Web server controls.

The other option for form validation is to put some client-side Java Script or VBScript at the top of the ASP page that checks if the information in the fields is correct.Some sites on the Internet don't carry this inputted information back to the form page, and the user is then required to enter all the information into the form a second time.Obviously, this may cause people to leave your site for another.^ #start of the line [_A-Za-z0-9-\ ] # must start with string in the bracket [ ], must contains one or more ( ) ( # start of group #1 \.[_A-Za-z0-9-] # follow by a dot "." and string in the bracket [ ], must contains one or more ( ) )* # end of group #1, this group is optional (*) @ # must contains a "@" symbol [A-Za-z0-9-] # follow by string in the bracket [ ], must contains one or more ( ) ( # start of group #2 - first level TLD checking \.[A-Za-z0-9] # follow by a dot "." and string in the bracket [ ], must contains one or more ( ) )* # end of group #2, this group is optional (*) ( # start of group #3 - second level TLD checking \.[A-Za-z] # follow by a dot "." and string in the bracket [ ], with minimum length of 2 ) # end of group #3 $ #end of the line The combination means, email address must start with “_A-Za-z0-9-\ ” , optional follow by “.[_A-Za-z0-9-]”, and end with a “@” symbol. Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected] , true Email is valid : [email protected], true Email is valid : [email protected] , true Email is valid : mkyong [email protected], true Email is valid : [email protected], true Email is valid : mkyong , false Email is valid : [email protected] , false Email is valid : [email protected] , false Email is valid : [email protected], false Email is valid : [email protected] , false Email is valid : [email protected], false Email is valid : mkyong()*@, false Email is valid : [email protected]%*, false Email is valid : [email protected], false Email is valid : [email protected], false Email is valid : [email protected]@, false Email is valid : [email protected] , false PASSED: Valid Email Test([ The email’s domain name must start with “A-Za-z0-9-“, follow by first level Tld (.com, .net) “.[A-Za-z0-9]” and optional follow by a second level Tld (au, my) “\.[A-Za-z]”, where second level Tld must start with a dot “.” and length must equal or more than 2 characters.

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From there, you can compare user input in different fields or against values that might be held in other repositories, such as a database.

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