Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Configuration/RegexMatchTimeoutValidator.cs

@@ -0,0 +1,16 @@
+namespace System.Web.Configuration {
+    using System;
+    using System.Configuration;
+
+    // Used for validating a timeout to be passed as the default match timeout for Regex
+    internal sealed class RegexMatchTimeoutValidator : TimeSpanValidator {
+
+        private static readonly TimeSpan _minValue = TimeSpan.Zero;
+        private static readonly TimeSpan _maxValue = TimeSpan.FromMilliseconds(Int32.MaxValue - 1); // from Regex.cs
+
+        public RegexMatchTimeoutValidator()
+            : base(_minValue, _maxValue) {
+        }
+
+    }
+}