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Application of regex in vi editor

One can use the search and replace command of "sed" also in vi editor. In the command, press ":" to open the command at the bottom of the windows and enter the following string to try it out on a file like "RollList.csv".

  :%s/^\(.*\),\(.*\)$/\2,\1@smail.iitm.ac.in/g

The "%" at the beginning tells that search/replace command should be applied to the whole file. If we wish to apply to first 10 lines, we would write as follows:

  :1,10s/^\(.*\),\(.*\)$/\2,\1@smail.iitm.ac.in/g

The "g" at the end tells that search/replace command should be applied to the lines as many times as possible. If we wish to apply only once, we would write as follows:

  :%s/^\(.*\),\(.*\)$/\2,\1@smail.iitm.ac.in/