linux grep commands please provide commands for each bullet point

1. Using Regular expressions with 'grep' (use UMass Whois.txt as your input file): o Display all dates in the file. o Display all the words that are all-upper case (with spaces on both sides). o Display all domain extensions in the document (.edu or.EDU,.com or .COM,.biz or .BIZ,...). Display the matches and the line numbers. Display all the numbers that have at least 2 digits and delimited by at least one space (e.g. the number 31 in NS31 does not fulfil the condition). Display all root domain names (i.e. the words that come right before the .com, .edu, .biz,... of a URL) o O