Unix

Write down the extended regular expression for following questions. E.g. Social security number in the format of 999-99-9999. [0-9]{3} - [0 - 9]{2} - [0 - 9]{4} Valid URL beginning with "http: //" and ending with ".edu" (e.g. http: //cs.gsu.edu, http: //gsu.edu) Non-negative integers. (eg, 0, +1, 3320) A valid absolute pathname in Unix (e.g. /home/ylong4, /test/try.c) 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) Phone number in any of the following format: 9999999999,999-999- 9999, (999)-999-9999