Help me with python read file and save file

[perfringo]

re.findall("(r'([a-z0-9]+(\.[a-z0-9]+)*@[a-z]+(\.[a-z]+)+)')",line)

Is this regex delivers expected results? My casual observation with regex101.com matches "r'[email protected]'".

re.compile("(r'([a-z0-9]+(\.[a-z0-9]+)*@[a-z]+(\.[a-z]+)+)')", re.DEBUG)
SUBPATTERN 1 0 0
  LITERAL 114     # r 
  LITERAL 39      # '
  SUBPATTERN 2 0 0
    MAX_REPEAT 1 MAXREPEAT
      IN
        RANGE (97, 122)
        RANGE (48, 57)
    MAX_REPEAT 0 MAXREPEAT
      SUBPATTERN 3 0 0
        LITERAL 46
        MAX_REPEAT 1 MAXREPEAT
          IN
            RANGE (97, 122)
            RANGE (48, 57)
/../