Lab 2 improvements

[Hammarn]

Add an example of .split() since it's probably very useful for Q4.
Add rstrip() since it removes newlines automatically, otherwise, they have to do string.strip("\n")

[Hammarn]

Also change the excersice with the interleaved to take input from command line(prob sys.arg) and handle long files

[Hammarn]

Include a few more examples of regexes, maybe have the table that I linked to in the text itself.