Added missing prefix 'r' (raw string) for regex

Author: marcodebe

ecg/ecg.py

@@ -419,7 +419,7 @@ def print_info(self, interpretation):
  pat_bdate = ""
 
  # Strip microseconds from acquisition date
- regexp = "\.\d+$"
+ regexp = r"\.\d+$"
  acquisition_date_no_micro = re.sub(
  regexp, '', self.dicom.AcquisitionDateTime)