Write down the extended regular expression for following questions. E.g. Social security number in the format of

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Question:

Write down the extended regular expression for following questions. E.g. Social security number in the format of 999-99-9999. Answer: [0-9]{3}-[0-9]{2}-[0-9]{4}

Verify outcomes by executing these in your Linux workspace. Copy the outcome of the workspace (screenshot) along with your theoretical answer.

Points per question: 5

19) Valid URL beginning with "http://" and ending with ".edu" (e.g.http://cs.gsu.edu,http://gsu.edu)

20) Non-negative integers. (e.g. 0, +1, 3320)

21) A valid absolute pathname in Unix (e.g. /home/csc3320, /test/try.c)

([./]+[a-z]*)*

22) Identifiers which can be between 1 and 10 characters long, must start with a letter or an underscore. The following characters can be letters or underscores or digits. (e.g. number, _name1, isOK).

23) Phone number in any of the following formats: 9999999999,999-999- 9999, (999)-999-9999. (Note: all of these formats should be matched by a single regular expression)