Remove email regex timeout validation

Common/Util/Validate.cs

@@ -13,7 +13,6 @@
  * limitations under the License.
 */
 
-using System;
 using System.Globalization;
 using System.Text.RegularExpressions;
 
@@ -91,21 +90,19 @@ private static string NormalizeEmailAddressDomainName(string emailAddress)
         /// </summary>
         public static class RegularExpression
         {
-            private static readonly TimeSpan MatchTimeout = TimeSpan.FromMilliseconds(100);
-
             /// <summary>
             /// Matches the domain name in an email address ignored@[domain.com]
             /// Pattern sourced via msdn:
             /// https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
             /// </summary>
-            public static readonly Regex EmailDomainName = new Regex(@"(@)(.+)$", RegexOptions.Compiled, MatchTimeout);
+            public static readonly Regex EmailDomainName = new Regex(@"(@)(.+)$", RegexOptions.Compiled);
 
             /// <summary>
             /// Matches a valid email address address@sub.domain.com
             /// Pattern sourced via msdn:
             /// https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
             /// </summary>
-            public static readonly Regex Email = new Regex(@"^(?("")("".+?(?<!\\)""@)|(([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 | RegexOptions.Compiled, MatchTimeout);
+            public static readonly Regex Email = new Regex(@"^(?("")("".+?(?<!\\)""@)|(([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 | RegexOptions.Compiled);
         }
     }
 }