Regular Expression not work in xamarin form

i try to match email with regex but it will not work.

Regex.IsMatch(email, @[a-zA-Z0-9+._\%-+]{1,256} +
"\@" +
"[a-zA-Z0-9][a-zA-Z0-9\-]{0,64}" +
"(" +
"\." +
"[a-zA-Z0-9][a-zA-Z0-9\-]{0,25}" +
")+");

How to fix?