Unix Programming d) Give regular expressions (such that could be used with grep

Question

Unix Programming

d) Give regular expressions (such that could be used with grep and egrep) for each of the following:

- All lines ending with the phrase ‘here below’

- All lines that end in either ‘y’ or ‘z’

- All lines that contain the word ‘index’ followed by any odd number/digit followed by any even number/digit (ignore 0’s)

- All lines that contain either 0 or 1 instances of the character ‘R’, but no more

- All lines that contain a word with 1 or more of the letter ‘a’, followed by 0 or 1 of the letter ‘b’, followed by the letter ‘c’

Explanation / Answer

1- All lines ending with the phrase ‘here below’

grep 'here below$' filename

2- All lines that end in either ‘y’ or ‘z’

with grep: grep 'y$|z$' filename

with egrep: grep 'y$|z$' filename

3- All lines that contain the word ‘index’ followed by any odd number/digit followed by any even number/digit (ignore 0’s)

egrep 'index[13579]*[2468]*' filename

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