The pattern syntax currently supported is that specified by ICU. The fundamental matching method for NSRegular Expression is a Block iterator method that allows clients to supply a Block object which will be invoked each time the regular expression matches a portion of the target string.There are additional convenience methods for returning all the matches as an array, the total number of matches, the first match, and the range of the first match.The third parameter is a Match Evaluator delegate that represents the method that processes and replaces the matched text. The regular expression pattern is interpreted as follows. Regular Expressions Public Class Regex Utilities Dim invalid As Boolean = False public Function Is Valid Email(str In As String) As Boolean invalid = False If String. When the data annotation attribute used for e-mail validation, the issue on mobile was resolved. 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. The NSRegular Expression class is used to represent and apply regular expressions to Unicode strings.An instance of this class is an immutable representation of a compiled regular expression pattern and various option flags.
Obviously there are expressions that you could use to determine if the format of an e-mail address is valid but you can also use the System.
If it all works, you can continously monitor your address list to ensure email addresses continue to be valid - Some mail servers may return a positive response even if the mailbox doesn’t exist.
Just an FYI: I'm the author of Mime Kit which has already been mentioned on this thread.
The best thing I have found is this bool is Email = Regex.
Instead of using a regular expression to validate an email address, you can use the System.