diff --git a/pdfsearch/pdfsearch.py b/pdfsearch/pdfsearch.py
index 35bfd4e..d07743c 100644
--- a/pdfsearch/pdfsearch.py
+++ b/pdfsearch/pdfsearch.py
@@ -87,7 +87,7 @@ def search_pdf(pdf_name, search_patterns, context_length):
             for pattern in search_patterns:
                 if pattern == pattern.lower():
                     # Ignore case if pattern is all lowercase
-                    matches = re.finditer(pattern, page_text.lower())
+                    matches = re.finditer(pattern, page_text, re.IGNORECASE)
                 else:
                     # Respect case if pattern is mixed or uppercase
                     matches = re.finditer(pattern, page_text)