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

One way to handle optional parts is to use regex text (optional part|). The part inside parenthesis will match either "optional part" (which can be a regex on its own) or nothing.