2. Write down the extended regular expression for following questions. E.g. Soci

Question

2. 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}

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

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

3) A valid absolute pathname in Unix (e.g. /home/ylong4, /test/try.c)

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

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

Explanation / Answer

1)

2)

(([1-9][0-9])* | 0)?

3)

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

4)

[_a-Z]{10}

5)

[0-9]{10}

[0-9]{3}-[0-9]{3}-[0-9]{4}

([0-9]{3})-[0-9]{2}-[0-9]{4}

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