diff --git a/pyhamtools/dxcluster.py b/pyhamtools/dxcluster.py
index 2417382..c148c76 100644
--- a/pyhamtools/dxcluster.py
+++ b/pyhamtools/dxcluster.py
@@ -19,18 +19,18 @@ def decode_char_spot(raw_string):
     data = {}
 
     # Spotter callsign
-    if re.match('[A-Za-z0-9\/]+[:$]', raw_string[6:15]):
-        data[const.SPOTTER] = re.sub(':', '', re.match('[A-Za-z0-9\/]+[:$]', raw_string[6:15]).group(0))
+    if re.match(r'[A-Za-z0-9\/]+[:$]', raw_string[6:15]):
+        data[const.SPOTTER] = re.sub(':', '', re.match(r'[A-Za-z0-9\/]+[:$]', raw_string[6:15]).group(0))
     else:
         raise ValueError
 
-    if re.search('[0-9\.]{5,12}', raw_string[10:25]):
-        data[const.FREQUENCY] = float(re.search('[0-9\.]{5,12}', raw_string[10:25]).group(0))
+    if re.search(r'[0-9\.]{5,12}', raw_string[10:25]):
+        data[const.FREQUENCY] = float(re.search(r'[0-9\.]{5,12}', raw_string[10:25]).group(0))
     else:
         raise ValueError
 
-    data[const.DX] = re.sub('[^A-Za-z0-9\/]+', '', raw_string[26:38])
-    data[const.COMMENT] = re.sub('[^\sA-Za-z0-9\.,;\#\+\-!\?\$\(\)@\/]+', ' ', raw_string[39:69]).strip()
+    data[const.DX] = re.sub(r'[^A-Za-z0-9\/]+', '', raw_string[26:38])
+    data[const.COMMENT] = re.sub(r'[^\sA-Za-z0-9\.,;\#\+\-!\?\$\(\)@\/]+', ' ', raw_string[39:69]).strip()
     data[const.TIME] = datetime.now().replace(tzinfo=UTC)
 
     return data