diff --git a/src/gdiffer/issue_detector.py b/src/gdiffer/issue_detector.py
index 7efb08f..36fad45 100644
--- a/src/gdiffer/issue_detector.py
+++ b/src/gdiffer/issue_detector.py
@@ -21,15 +21,22 @@ class IssueDetector:
 
     SECURITY_PATTERNS = [
         {
-            'pattern': r'(?i)(sql\s*\(|execute\s*\(|exec\s*\(|SELECT\s+|UPDATE\s+|INSERT\s+|DELETE\s+)',
+            'pattern': (
+                r'(?i)(sql\\s*\\(|execute\\s*\\(|exec\\s*\\(|SELECT\\s+|UPDATE\\s+|'
+                r'INSERT\\s+|DELETE\\s+)'
+            ),
             'type': 'sql_injection',
             'severity': 'critical',
             'title': 'Potential SQL Injection',
-            'description': 'String concatenation or interpolation used in SQL query',
-            'suggestion': 'Use parameterized queries or ORM methods instead of string concatenation',
+            'description': (
+                'String concatenation or interpolation used in SQL query'
+            ),
+            'suggestion': (
+                'Use parameterized queries or ORM methods instead of string concatenation'
+            ),
         },
         {
-            'pattern': r'(?i)(innerHTML\s*=|outerHTML\s*=|document\.write\s*\()',
+            'pattern': r'(?i)(innerHTML\\s*=|outerHTML\\s*=|document\\.write\\s*\\()',
             'type': 'xss',
             'severity': 'critical',
             'title': 'Potential XSS Vulnerability',
@@ -37,7 +44,7 @@ class IssueDetector:
             'suggestion': 'Use textContent or sanitize HTML before insertion',
         },
         {
-            'pattern': r'(?i)(eval\s*\(|setTimeout\s*\(\s*['"]|setInterval\s*\(\s*['"])',
+            'pattern': r'(?i)(eval\\s*\\(|setTimeout\\s*\\(\\s*[\\'\\"]|setInterval\\s*\\(\\s*[\\'\\"])',
             'type': 'code_injection',
             'severity': 'critical',
             'title': 'Code Injection Risk',
@@ -45,7 +52,7 @@ class IssueDetector:
             'suggestion': 'Avoid eval() and dynamic code execution when possible',
         },
         {
-            'pattern': r'(?i)(os\.system\s*\(|subprocess\.|shell=True|popen)',
+            'pattern': r'(?i)(os\\.system\\s*\\(|subprocess\\.|shell=True|popen)',
             'type': 'command_injection',
             'severity': 'critical',
             'title': 'Command Injection Risk',
@@ -53,7 +60,7 @@ class IssueDetector:
             'suggestion': 'Use subprocess with shell=False and validate/sanitize inputs',
         },
         {
-            'pattern': r'(?i)(password\s*=|passwd\s*=|secret\s*=|token\s*=|api_key\s*=)',
+            'pattern': r'(?i)(password\\s*=|passwd\\s*=|secret\\s*=|token\\s*=|api_key\\s*=)',
             'type': 'hardcoded_secret',
             'severity': 'high',
             'title': 'Hardcoded Secret Detected',
@@ -69,7 +76,7 @@ class IssueDetector:
             'suggestion': 'Use HTTPS for all network communications',
         },
         {
-            'pattern': r'(?i)(random\.randint\s*\(|random\.random\s*\()',
+            'pattern': r'(?i)(random\\.randint\\s*\\(|random\\.random\\s*\\()',
             'type': 'weak_crypto',
             'severity': 'medium',
             'title': 'Weak Random Number Generator',
@@ -80,7 +87,7 @@ class IssueDetector:
 
     BUG_PATTERNS = [
         {
-            'pattern': r'(?i)(if\s*\([^)]*==[^)]*\)\s*:|if\s*\([^)]*=\s*[^)]*\)\s*:)',
+            'pattern': r'(?i)(if\\s*\\([^)]*==[^)]*\\)\\s*:|if\\s*\\([^)]*=\\s*[^)]*\\)\\s*:)',
             'type': 'assignment_in_condition',
             'severity': 'high',
             'title': 'Assignment in Condition',
@@ -88,7 +95,7 @@ class IssueDetector:
             'suggestion': 'Use == for comparison, not =',
         },
         {
-            'pattern': r'(?i)(\bNone\b.*==|==.*\bNone\b)',
+            'pattern': r'(?i)(\\bNone\\b.*==|==.*\\bNone\\b)',
             'type': 'none_comparison',
             'severity': 'medium',
             'title': 'Direct None Comparison',
@@ -96,7 +103,7 @@ class IssueDetector:
             'suggestion': 'Use "is None" for None comparisons in Python',
         },
         {
-            'pattern': r'\bexcept\s*:\s*$',
+            'pattern': r'\\bexcept\\s*:\\s*$',
             'type': 'bare_except',
             'severity': 'medium',
             'title': 'Bare Except Clause',
@@ -104,7 +111,7 @@ class IssueDetector:
             'suggestion': 'Catch specific exceptions or at least Exception',
         },
         {
-            'pattern': r'(?i)(\.get\s*\(\s*['"]?\s*['"]?\s*\))',
+            'pattern': r'(?i)(\\.get\\s*\\(\\s*[\\'\\"]?\\s*[\\'\\"]?\\s*\\))',
             'type': 'unused_get',
             'severity': 'low',
             'title': 'Dictionary get() with no default',
@@ -115,7 +122,7 @@ class IssueDetector:
 
     CODE_SMELL_PATTERNS = [
         {
-            'pattern': r'^\s*for\s+.*\s+in\s+.*:\s*$',
+            'pattern': r'^\\s*for\\s+.*\\s+in\\s+.*:\\s*$',
             'type': 'long_loop',
             'severity': 'low',
             'title': 'Complex Loop',
@@ -123,7 +130,7 @@ class IssueDetector:
             'suggestion': 'Consider using list comprehensions or vectorized operations',
         },
         {
-            'pattern': r'(?i)(\bTODO\b|\bFIXME\b|\bHACK\b|\bXXX\b)',
+            'pattern': r'(?i)(\\bTODO\\b|\\bFIXME\\b|\\bHACK\\b|\\bXXX\\b)',
             'type': 'code_tag',
             'severity': 'low',
             'title': 'Code Tag Found',
@@ -131,7 +138,7 @@ class IssueDetector:
             'suggestion': 'Address the TODO or create a ticket to track it',
         },
         {
-            'pattern': r'(?i)(\bprint\s*\(|console\.log\s*\()',
+            'pattern': r'(?i)(\\bprint\\s*\\(|console\\.log\\s*\\()',
             'type': 'debug_statement',
             'severity': 'low',
             'title': 'Debug Statement',
@@ -147,7 +154,7 @@ class IssueDetector:
             'suggestion': 'Split long lines for better readability',
         },
         {
-            'pattern': r'\bpass\b',
+            'pattern': r'\\bpass\\b',
             'type': 'empty_block',
             'severity': 'low',
             'title': 'Empty Code Block',
@@ -192,7 +199,9 @@ class IssueDetector:
 
         return issues
 
-    def detect_diff_issues(self, old_code: str, new_code: str, language: str = "text") -> list[Issue]:
+    def detect_diff_issues(
+        self, old_code: str, new_code: str, language: str = "text"
+    ) -> list[Issue]:
         """Detect issues specifically in the diff (added/modified lines)."""
         issues = []
         new_lines = new_code.splitlines()