diff --git a/samples/RoutingSample.Web/Startup.cs b/samples/RoutingSample.Web/Startup.cs
index fad1c866ce..6854c6aae8 100644
--- a/samples/RoutingSample.Web/Startup.cs
+++ b/samples/RoutingSample.Web/Startup.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Text.RegularExpressions;
 using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
@@ -49,7 +50,11 @@ namespace RoutingSample.Web
             routeBuilder.MapRoute("regexRoute",
                                   "api/r2constraint/{controller}",
                                   new { foo = "Bar2" },
-                                  new { controller = new RegexRouteConstraint(new Regex("^(my.*)$")) });
+                                  new
+                                  {
+                                      controller = new RegexRouteConstraint(
+                                          new Regex("^(my.*)$", RegexOptions.None, TimeSpan.FromSeconds(10)))
+                                  });
 
             routeBuilder.MapRoute("parameterConstraintRoute",
                                   "api/{controller}/{*extra}",
diff --git a/src/Microsoft.AspNet.Routing/Constraints/RegexRouteConstraint.cs b/src/Microsoft.AspNet.Routing/Constraints/RegexRouteConstraint.cs
index f9fd0ea9df..87d69eea5b 100644
--- a/src/Microsoft.AspNet.Routing/Constraints/RegexRouteConstraint.cs
+++ b/src/Microsoft.AspNet.Routing/Constraints/RegexRouteConstraint.cs
@@ -12,6 +12,8 @@ namespace Microsoft.AspNet.Routing.Constraints
 {
     public class RegexRouteConstraint : IRouteConstraint
     {
+        private static readonly TimeSpan RegexMatchTimeout = TimeSpan.FromSeconds(10);
+
         public RegexRouteConstraint([NotNull] Regex regex)
         {
             Constraint = regex;
@@ -19,7 +21,10 @@ namespace Microsoft.AspNet.Routing.Constraints
 
         public RegexRouteConstraint([NotNull] string regexPattern)
         {
-            Constraint = new Regex(regexPattern, RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
+            Constraint = new Regex(
+                regexPattern,
+                RegexOptions.CultureInvariant | RegexOptions.IgnoreCase,
+                RegexMatchTimeout);
         }
 
         public Regex Constraint { get; private set; }