diff --git a/src/metricsAnalyzer/metricsAnalyzerFactory.ts b/src/metricsAnalyzer/metricsAnalyzerFactory.ts
index 0f40076..51b2662 100644
--- a/src/metricsAnalyzer/metricsAnalyzerFactory.ts
+++ b/src/metricsAnalyzer/metricsAnalyzerFactory.ts
@@ -42,9 +42,9 @@ export interface UnifiedFunctionMetrics {
   complexity: number;
   /** Array of individual complexity details that contribute to the total score */
   details: UnifiedMetricsDetail[];
-  /** Line number where the function definition starts (1-based) */
+  /** Line number where the function definition starts (0-based) */
   startLine: number;
-  /** Line number where the function definition ends (1-based) */
+  /** Line number where the function definition ends (0-based) */
   endLine: number;
   /** Column number where the function definition starts (0-based) */
   startColumn: number;
diff --git a/src/providers/codeLensProvider.ts b/src/providers/codeLensProvider.ts
index 91917a4..9f633be 100644
--- a/src/providers/codeLensProvider.ts
+++ b/src/providers/codeLensProvider.ts
@@ -70,18 +70,26 @@ export class MetricsCodeLensProvider implements vscode.CodeLensProvider {
       const hasPathSeparators = normalizedPattern.includes("/");
 
       if (hasPathSeparators) {
-        // Pattern contains path separators - match against full path
+        // Pattern contains path separators - match against full path.
+        // Step 1: preserve wildcards as null-byte placeholders so they survive
+        //         regex escaping; Step 2: escape regex metacharacters in the
+        //         literal portions; Step 3: restore wildcards as regex tokens.
         const regexPattern = normalizedPattern
-          .replace(/\*\*/g, "___DOUBLESTAR___") // Temporary placeholder
-          .replace(/\*/g, "[^/]*") // Single * matches within directory
-          .replace(/___DOUBLESTAR___/g, ".*"); // ** matches across directories
+          .replace(/\*\*/g, "\x00DS\x00") // placeholder for **
+          .replace(/\*/g, "\x00S\x00") // placeholder for *
+          .replace(/[.+?^${}()|[\]\\]/g, "\\$&") // escape regex metacharacters
+          .replace(/\x00DS\x00/g, ".*") // ** matches across directories
+          .replace(/\x00S\x00/g, "[^/]*"); // single * matches within directory
 
         const regex = new RegExp(`^${regexPattern}$`);
         return regex.test(normalizedPath);
       } else {
-        // Pattern has no path separators - match against filename only
+        // Pattern has no path separators - match against filename only.
         const filename = normalizedPath.split("/").pop() || "";
-        const regexPattern = normalizedPattern.replace(/\*/g, ".*"); // * matches any characters in filename
+        const regexPattern = normalizedPattern
+          .replace(/\*/g, "\x00S\x00") // placeholder for *
+          .replace(/[.+?^${}()|[\]\\]/g, "\\$&") // escape regex metacharacters
+          .replace(/\x00S\x00/g, ".*"); // * matches any characters in filename
 
         const regex = new RegExp(`^${regexPattern}$`);
         return regex.test(filename);
diff --git a/src/test/providers/codeLensProvider.test.ts b/src/test/providers/codeLensProvider.test.ts
index 4aceb62..cd333ec 100644
--- a/src/test/providers/codeLensProvider.test.ts
+++ b/src/test/providers/codeLensProvider.test.ts
@@ -320,6 +320,44 @@ suite("Metrics Code Lens Provider Tests", () => {
         },
         { pattern: "test*", path: "/path/test.cs", shouldExclude: true },
         { pattern: "test*", path: "/path/src.cs", shouldExclude: false },
+        // Regex metacharacter escaping: literal dots must not act as wildcards
+        // Full-path branch (pattern contains a path separator)
+        {
+          pattern: "**/*.min.js",
+          path: "/path/to/foo.min.js",
+          shouldExclude: true,
+        },
+        {
+          pattern: "**/*.min.js",
+          path: "/path/to/fooXminXjs",
+          shouldExclude: false,
+        },
+        {
+          pattern: "**/*.spec.*",
+          path: "/path/to/app.spec.ts",
+          shouldExclude: true,
+        },
+        {
+          pattern: "**/*.spec.*",
+          path: "/path/to/appXspecXts",
+          shouldExclude: false,
+        },
+        // Filename-only branch (pattern has no path separator)
+        {
+          pattern: "*.generated.*",
+          path: "/path/fooXgeneratedXcs",
+          shouldExclude: false,
+        },
+        {
+          pattern: "*.min.js",
+          path: "/path/foo.min.js",
+          shouldExclude: true,
+        },
+        {
+          pattern: "*.min.js",
+          path: "/path/fooXminXjs",
+          shouldExclude: false,
+        },
       ];
 
       for (const testCase of testCases) {