You don't need regular expression. This validation is already done in the class
System.Uri, by its constructor. You can find an example here:
https://msdn.microsoft.com/en-us/library/system.uri.urischememailto%28v=vs.110%29.aspx[
^].
Also, you should handle and catch exceptions, as the string might not be valid. For the exceptions which can be thrown, please see:
https://msdn.microsoft.com/en-us/library/z6c2z492%28v=vs.110%29.aspx[
^].
If you don't expect "mailto:" in the test string, you have to prefix your input string with it. You can take it from
System.Uri.UriSchemeMailto.
Put it all together to create the validation. As an additional bonus, you will get not just true/false answer, but, in case of successful validation, the instance of
Systen.Uri, which is much more useful/informative than raw string.
—SA
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