First check to see if the first character is alphabetical. Second, check to see if there is only one @ in the address. Third, check to see if the character after the @ is not a dot. It's tantamount to, say I come with a question on how to calculate the derivative of x Er, what is this for?
I am trying to learn from it, but I am still confused.
The following c# example codes demonstrate how to test emailaddress without specified SMTP server.
Validate EmailAddress Syntax Regular expression can be used to validate if an emailaddress is in correct format.
Note that the regular expression is compiled using the System. This pattern can be repeated one or more times, and must be followed by the top-level domain name.