diff --git a/imap_filter/imap_filter.py b/imap_filter/imap_filter.py
index 85b0086..8016bf9 100644
--- a/imap_filter/imap_filter.py
+++ b/imap_filter/imap_filter.py
@@ -221,8 +221,8 @@ class ImapFilter:
                     "Line '%s' found in current file",
                     search
                 )
-                # new_content = re.sub(search, replacement, content)
-                new_content = content.replace(search, replacement)
+                new_content = re.sub(search, replacement, content)
+                # new_content = content.replace(search, replacement)
                 if content != new_content:
                     self._log.debug(
                         "Line it's different, so replacing it with '%s'",