0 votes 0 votes Tick is correct answer but how do we know which way to take common because it affect the language , is regular expression written in red is correct ? sumit goyal 1 asked Dec 30, 2017 sumit goyal 1 228 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply joshi_nitish commented Dec 30, 2017 reply Follow Share both are equivalent (ticked one and red-written one) 2 votes 2 votes sumit goyal 1 commented Dec 30, 2017 reply Follow Share joshi_nitish is there is a rule , because sometimes after taking out common we can get incorrect answer 0 votes 0 votes Please log in or register to add a comment.