# Microsoft.AspNetCore.Routing.Constraints

``` diff
 namespace Microsoft.AspNetCore.Routing.Constraints {
     public class RegexRouteConstraint : IParameterLiteralNodeMatchingPolicy, IParameterPolicy, IRouteConstraint {
-        public RegexRouteConstraint([StringSyntaxAttribute("Regex", new object[]{ 513})] string regexPattern);
+        public RegexRouteConstraint([StringSyntaxAttribute("Regex", new object[]{ 521})] string regexPattern);
     }
 }
```

