diff --git a/pyomd/note.py b/pyomd/note.py
index be0d37d..b647af9 100644
--- a/pyomd/note.py
+++ b/pyomd/note.py
@@ -30,7 +30,7 @@ def __init__(self, path: Union[Path, str]):
         """
         self.path: Path = Path(path)
         try:
-            with open(self.path, "r") as f:
+            with open(self.path, "r", encoding="utf-8", newline='\n') as f:
                 self.content: str = f.read()
         except Exception as e:
             raise NoteCreationError(path=path, exception=e) from e
@@ -73,7 +73,7 @@ def sub(self, pattern: str, replace: str, is_regex: bool = False):
         """
         if not is_regex:
             pattern = re.escape(pattern)
-        self.content = re.sub(pattern, replace, self.content)
+        self.content = re.sub(pattern, replace, self.content, flags=re.MULTILINE)
 
     def update_content(
         self,
@@ -130,7 +130,7 @@ def write(self, path: Union[Path, None] = None):
                 path to the note. If None, overwrites the current note content.
         """
         p = self.path if path is None else path
-        with open(p, "w") as f:
+        with open(p, "w", encoding="utf-8", newline='\n') as f:
             f.write(self.content)
 
     @staticmethod