Fix hotspots on dotnet solution (#103)

Author: costin-zaharia-sonarsource

sonar-text-dotnet/src/SonarLint.Secrets.DotNet/DummySecretDetector.cs

@@ -30,7 +30,7 @@ namespace SonarLint.Secrets.DotNet
     internal sealed class DummySecretDetector : ISecretDetector
     {
         private const string PasswordPattern = "sonarlint\\.internal\\.dummy\\.password\\=(?<pwd>[\\w-]+)\\s";
-        private static readonly Regex StackRegExp = new Regex(PasswordPattern);
+        private static readonly Regex StackRegExp = new Regex(PasswordPattern, RegexOptions.None, RegexConstants.DefaultTimeout);
 
         private const string RuleKey = "secrets:sonarlint.internal.dummy.pwd";
 

sonar-text-dotnet/src/SonarLint.Secrets.DotNet/RegexConstants.cs

@@ -0,0 +1,29 @@
+/*
+ * SonarAnalyzer for Text
+ * Copyright (C) 2021-2023 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+using System;
+
+namespace SonarLint.Secrets.DotNet
+{
+    public static class RegexConstants
+    {
+        public static TimeSpan DefaultTimeout => TimeSpan.FromMilliseconds(100);
+    }
+}

sonar-text-dotnet/src/SonarLint.Secrets.DotNet/Rules/Matching/RegexMatcher.cs

@@ -30,7 +30,7 @@ internal class RegexMatcher : ISecretsMatcher
 
         public RegexMatcher(string stringPattern)
         {
-            this.pattern = new Regex(stringPattern, RegexOptions.Compiled);
+            this.pattern = new Regex(stringPattern, RegexOptions.Compiled, RegexConstants.DefaultTimeout);
         }
 
         public List<Match> FindIn(string input)