Unit test to repro

diff --git a/src/libraries/System.Text.RegularExpressions/tests/RegexParserTests.cs b/src/libraries/System.Text.RegularExpressions/tests/RegexParserTests.cs
index 42ad4d4..a0d4e0d 100644 (file)
--- a/src/libraries/System.Text.RegularExpressions/tests/RegexParserTests.cs
+++ b/src/libraries/System.Text.RegularExpressions/tests/RegexParserTests.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics;
 using System.Reflection;
 using Xunit;
 using Xunit.Sdk;
@@ -881,5 +882,13 @@ namespace System.Text.RegularExpressions.Tests
 
             throw new XunitException($"Expected RegexParseException with error: ({error}) -> Actual: No exception thrown");
         }
+
+        [Fact]
+        public void TestPattern()
+        {
+            Debugger.Launch();
+            string pattern = @"[b-\-a]";
+            var regex = new Regex(pattern);
+        }
     }
 }