Regular Expression Exercise 1

Write a statement with the grep command and regular expressions to find the given pattern for each one of the cases on the following list.

1. Try this on the command line and explain what it is doing: grep hom.*ds p*

2. Print all lines containing the expression 70 in " peopleonEarth.txt "

3. Print all lines beginning with a t or T

4. Print all lines ending with a 4

5. Print all lines containing people

6. Print all lines containing the number 4

7. Print all lines containing the number 4 followed by a comma ,

8. Print all lines containing the expression ,4

9. Print all lines containing the number 4 followed by a comma , and any single character

10. Print all lines beginning with either an I or a T

11. Print all lines containing one non-digit

12. Print all lines containing digits followed by a space and a capital letter

13. Print all lines containing an s followed by zero or more consecutive occurrences of the letter s and a space.

14. Print all lines containing at least nine consecutive lowercase letters (i.e. northeast)

15. Print all lines containing a word starting with human

16. Print all lines if they contain the word million

17. Print all lines containing a word starting with a lowercase letter and followed by any number of characters and ending with t

Exercise 2

In this exercise you are going to examine Grep with options.

1. Print all lines beginning with either an I or a T and try in this case to execute the grep command with each one of the following options (individually, not all of them at the same time): -n, -i, -l, -c, -w. Whats the result for each one?

2. Print all lines if they contain the word million and try in this case to execute the grep command with each one of the following options (individually, not all of them at the same time): -v, -l, -w.