import re
import csv

with open("data.txt") as infile:
    text = infile.read()

regex = re.compile(
    r"""^(?P<device>\S*)           # Match non-whitespace device name
    \suptime\sis\s                 # Match " uptime is "
    (?P<uptime>[^\r\n]*)           # Match until end of line --> uptime
    .*?^System\simage\sfile\sis\s  # Match intervening text
    "[^:]*:                        # Match from quote to colon
    (?P<sifilename>[^"]*)          # Match everything until quote --> filename
    .*?^cisco\s                    # Match intervening text
    (?P<model>\S*)                 # Match non-whitespace model name
    .*?^Processor\sboard\sID\s     # Match intervening text
    (?P<serialno>[^\r\n]*)         # Match until end of line --> serial no""",
    re.DOTALL | re.MULTILINE | re.VERBOSE)
match = regex.search(text)

with open("results.txt", "a") as outfile:
    outcsv = csv.writer(outfile)
    outcsv.writerow(match.groups())