in reply to fourth digit should not match digit "2"
See the answers you (or your cohort) got to Regex for last digit should not be "2" and adapt them. Maybe consider reading your course material, and/or perlre or perlretut.
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (478 votes). Check out past polls.