It seems that the checking validation of email addresses is actually two separate problems: 1- Validation of email format: Making sure if the email complies with the format and pattern of emails in RFC 5322 and if the TLD actually exists. For example, although the address The only way to validate an email address is to send an email then wait for response.Apart of this, here is an url where you can test if your address is RFC822 compliant: mythic-beasts.com/~pdw/cgi-bin/emailvalidate . NET Regular Expression API Summary: Regular expressions are an extremely useful tool for working with text.Introduction Brief History of Regular Expressions Simple Expressions Quantifiers Metacharacters Character Classes Predefined Set Metacharacters Sample Expressions Validation in ASP.You can concatenate simple regular expressions into complex search criteria to validate against complex patterns, such as any of several words with different endings.You can use Cold Fusion variables and functions in regular expressions.Here's an example of the above in action: Almost all answers to this questions suggest using Regex to validate emails addresses.I think Regex is only good for a rudimentary validation.
Whether you need to validate user input, search for patterns within strings, or reformat text in powerful ways, regular expressions can help.This article is designed for beginners with little or no experience with regular expressions, but who are familiar with ASP. In this article, I will discuss: If you have questions about this article or regular expressions in general, I invite you to ask them on the regex mailing list at which as I'm writing this has over 350 subscribers.Regular expressions as they exist today were invented in the 1950s.Possible values are None, Ignore Case, Multiline, Explicit Capture, Compiled, Singleline, ECMAScript, Culture Invariant, Ignore Pattern White Space, and Right To Left. Reg Ex Resource Name - If you do not want to use the Pattern property to hard-code a regular expression (perhaps for internationalization), you can use a regular expression stored in the application resources.
You must also specify a Pattern Resource Name value.Though this solution may be simple, I'm sure this is one of those useful things that people will be Googling for and deserves its own entry on the site If only Google would be the first place to look :) Just look at the duplicates of this closed every some time.