diff --git a/src/dotenv/parser.py b/src/dotenv/parser.py
index eb100b47..701aff58 100644
--- a/src/dotenv/parser.py
+++ b/src/dotenv/parser.py
@@ -59,7 +59,7 @@ def set(self, other: "Position") -> None:
 
     def advance(self, string: str) -> None:
         self.chars += len(string)
-        self.line += len(re.findall(_newline, string))
+        self.line += string.count("\n") + string.count("\r") - string.count("\r\n")
 
 
 class Error(Exception):