help need to write regex in optional condition [Close]

Question

I have a logfile having contains as below

log=

       Using data from (yyyy/mm/dd): 2011/8/3
       0 files queued for scanning.
       Warning: E:\\tes         


        

Answer 1

The following works fine for me:

txt = open("test.txt").read()
print txt

import re
logdate = re.compile("Using.*: (?P\d{4}/\d+/\d+)")
logwarn = re.compile("Warning: (?P.*)")
dates = re.search(logdate, txt).groupdict()
warns = re.search(logwarn, txt).groupdict()
print dates
print warns