Solutions to HW 2
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1. egrep -n "[[:space:]][A-Z]{2}[[:space:]]" sample.txt

2. egrep -n "[A-Z][a-z]+, [A-Z][A-Z]" sample.txt

3. egrep -n "[A-Za-z]+ [0-9]{4}[^0-9]" sample.txt

4. egrep -n '\$ *[0-9]+\.[0-9][0-9]' sample.txt
(notice that here we use single quotes to prevent the shell from interpreting
the $ sign!)

5. egrep -n "(Mr\.|Mrs\.|Ms\.|Dr\.) [A-Za-z]+ ([A-Za-z]\. )?[A-Za-z]{11}" sample.txt

6. egrep -n "[a-z]\. *[a-z]|^[a-z]" sample.txt

7. egrep -n "^$" sample.txt