Moved logic to the Utilities class.

Oqtane.Client/Modules/Admin/Register/Index.razor

@@ -1,5 +1,4 @@
 @namespace Oqtane.Modules.Admin.Register
-@using System.Text.RegularExpressions;
 @inherits ModuleBase
 @inject NavigationManager NavigationManager
 @inject IUserService UserService
@@ -50,7 +49,7 @@
         try
         {
             _message = "";
-            IsValidEmail();
+            _isEmailValid  = Utilities.IsValidEmail(_email);
             if (_username != "" && _password != "" && _confirm != "" && _isEmailValid)
             {
                 if (_password == _confirm)
@@ -97,16 +96,4 @@
     {
         NavigationManager.NavigateTo(NavigateUrl(""));
     }
-
-    private void IsValidEmail()
-    {
-        if (_email != ""){
-            _isEmailValid = true;
-        }
-
-        _isEmailValid = Regex.IsMatch(_email,
-              @"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
-              @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$",
-              RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
-    }
 }

Oqtane.Shared/Shared/Utilities.cs

@@ -1,5 +1,7 @@
-using System.Globalization;
+using System;
+using System.Globalization;
 using System.Text;
+using System.Text.RegularExpressions;
 
 namespace Oqtane.Shared
 {
@@ -217,5 +219,18 @@ namespace Oqtane.Shared
                 return "";
             }
         }
+
+        public static bool IsValidEmail(string email)
+        {
+            if (email != "")
+            {
+                return true;
+            }
+
+            return Regex.IsMatch(email,
+                  @"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
+                  @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$",
+                  RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
+        }
     }
 }