Regular expression for validating email address in asp net

regular expression pattern to separate the domain name from the email address. If the character that follows @ is not an opening bracket, match one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by zero or more occurrences of a hyphen, followed by zero or one alphanumeric character with a value of A-Z, a-z, or 0-9, followed by a period.The third parameter is a Match Evaluator delegate that represents the method that processes and replaces the matched text. From Milliseconds(200)) Catch e As Regex Match Timeout Exception Return False Catch e As Argument Exception Return False End Try Try Return Regex. This pattern can be repeated one or more times, and must be followed by the top-level domain name.

The best way to confirm an email address is to email the user, and get the user to reply by clicking on a link to validate that they have recieved the email (the way most sign-up systems work). You should prevent XSS exploits, SQL injection and so on by escaping correctly when inserting strings into a different language where some characters are "magic", eg, when inserting strings in HTML or SQL.For example, these are all valid email addresses: So you should decide how restrictive you need to be in your matching.If this is for a user signing up on your website and if you’re going to email them a validation code then you might not need to be too strict. The @ sign is a super simple way to do some easy validation. But you could also throw in some length validation as well which is discussed below. This regex ensures the user typed at least one character before the @ and one after. @won’t match it but it will match most email addresses. The Validation Expression property has a button you can press in Visual Studio's property's panel that gets lists a lot of useful expressions. Controls You can use a Regular Expression validator.

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