Then present a warning giving the user a chance to say "yes, my mail server really does allow 🌮🍳🎁 as an email address." As for using exception handling for business logic, I agree that is a thing to be avoided. NET component that enables developers to read and write email files (MSG, EML, MHTML), and compose, receive and send email messages using IMAP, POP, and SMTP from . I had to remove the regex validation I used before for e-mail when I got mobile device specific regex failure on e-mail input field.there is many other important validations not just the string, it is better to check if the email is exists at this smtp server or the user is entering any email..You'd be surprised at some examples of valid e-mail addresses.
Instead of using a regular expression to validate an email address, you can use the System. Keep it simple, and don't mark some e-mail addresses that are actually valid as invalid. "Some people, when confronted with a problem, think ' I know, I'll use regular expressions.' Now they have two problems."——Jamie Zawinski on regular expressions; paraphrasing the Unix Haters Handbook on As @Simon pointed out, your regular expression might consider some valid addresses as invalid. The part before the @ sign is the local part of the address, and the part after the @ sign is a domain name to which the email message will be sent . The pattern parameter consists of various regular expression language elements that symbolically describe the string to match pattern .Trying to match these restrictions is a complex task, often resulting in long regular expressions. NET Framework regular expression classes are part of the base class library and can be used with any language or tool that targets the common language runtime, including ASP. The following C# source code shows how to validate an email address with the help of regular expressions.