Remove code.

src/EditorFeatures/CSharpTest/EmbeddedLanguages/ValidateRegexStringTests.cs

@@ -23,7 +23,6 @@ internal override (DiagnosticAnalyzer, CodeFixProvider) CreateDiagnosticProvider
         {
             var optionsSet = new Dictionary<OptionKey, object>();
             optionsSet.Add(new OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.CSharp), true);
-            optionsSet.Add(new OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.VisualBasic), true);
             return optionsSet;
         }
 

src/EditorFeatures/VisualBasicTest/EmbeddedLanguages/ValidateRegexStringTests.vb

@@ -18,18 +18,10 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EmbeddedLanguages
 
         Private Function OptionOn() As IDictionary(Of OptionKey, Object)
             Dim values = New Dictionary(Of OptionKey, Object)
-            values.Add(New OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.CSharp), True)
             values.Add(New OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.VisualBasic), True)
             Return values
         End Function
 
-        Private Function OptionOff() As IDictionary(Of OptionKey, Object)
-            Dim values = New Dictionary(Of OptionKey, Object)
-            values.Add(New OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.CSharp), False)
-            values.Add(New OptionKey(RegularExpressionsOptions.ReportInvalidRegexPatterns, LanguageNames.VisualBasic), False)
-            Return values
-        End Function
-
         <Fact, Trait(Traits.Feature, Traits.Features.ValidateRegexString)>
         Public Async Function TestWarning1() As Task
             Await TestDiagnosticInfoAsync("