diff --git a/src/gdiffer/code_analyzer.py b/src/gdiffer/code_analyzer.py
index d894af1..a94d496 100644
--- a/src/gdiffer/code_analyzer.py
+++ b/src/gdiffer/code_analyzer.py
@@ -81,7 +81,9 @@ class CodeAnalyzer:
         node_type = node.type
         node_text = node.text.decode() if isinstance(node.text, bytes) else node.text
 
-        function_keywords = ['function_definition', 'function_declaration', 'method_definition', 'func']
+        function_keywords = [
+            'function_definition', 'function_declaration', 'method_definition', 'func'
+        ]
         class_keywords = ['class_definition', 'class_declaration', 'struct', 'impl']
         import_keywords = ['import_statement', 'import_from_statement', 'import', 'require']
         call_keywords = ['call_expression', 'function_call', 'method_call', 'expression_statement']
@@ -157,34 +159,45 @@ class CodeAnalyzer:
         lines = code.splitlines()
         summary_parts = []
 
-        added_lines = [l for l in lines if l.strip().startswith('+') and not l.strip().startswith('+++')]
-        removed_lines = [l for l in lines if l.strip().startswith('-') and not l.strip().startswith('---')]
+        added_lines = [
+            line for line in lines
+            if line.strip().startswith('+') and not line.strip().startswith('+++')
+        ]
+        removed_lines = [
+            line for line in lines
+            if line.strip().startswith('-') and not line.strip().startswith('---')
+        ]
 
         if added_lines or removed_lines:
-            summary_parts.append(f"Added {len(added_lines)} lines, removed {len(removed_lines)} lines")
+            summary_parts.append(
+                f"Added {len(added_lines)} lines, removed {len(removed_lines)} lines"
+            )
 
         func_patterns = {
-            'python': r'^def\s+(\w+)',
-            'javascript': r'^function\s+(\w+)|const\s+(\w+)\s*=\s*function',
-            'java': r'^\s*(public|private|protected)?\s*(static\s+)?\s*\w+\s+(\w+)\s*\(',
-            'go': r'^func\s+(\w+)',
-            'rust': r'^fn\s+(\w+)',
+            'python': r'^def\\s+(\\w+)',
+            'javascript': r'^function\\s+(\\w+)|const\\s+(\\w+)\\s*=\\s*function',
+            'java': r'^\\s*(public|private|protected)?\\s*(static\\s+)?\\s*\\w+\\s+(\\w+)\\s*\\(',
+            'go': r'^func\\s+(\\w+)',
+            'rust': r'^fn\\s+(\\w+)',
         }
 
         for lang, pattern in func_patterns.items():
             funcs = re.findall(pattern, code, re.MULTILINE)
             if funcs:
-                func_names = [f if isinstance(f, str) else next((x for x in f if x), '') for f in funcs]
+                func_names = [
+                    f if isinstance(f, str) else next((x for x in f if x), '')
+                    for f in funcs
+                ]
                 func_names = [n for n in func_names if n]
                 if func_names:
                     summary_parts.append(f"Functions: {', '.join(func_names[:5])}")
                     break
 
         class_patterns = {
-            'python': r'^class\s+(\w+)',
-            'javascript': r'^class\s+(\w+)',
-            'java': r'^\s*class\s+(\w+)',
-            'rust': r'^struct\s+(\w+)',
+            'python': r'^class\\s+(\\w+)',
+            'javascript': r'^class\\s+(\\w+)',
+            'java': r'^\\s*class\\s+(\\w+)',
+            'rust': r'^struct\\s+(\\w+)',
         }
 
         for lang, pattern in class_patterns.items():