Lecture 7 (Regular Expressions) Exercise answers:

Slide 6:
      egrep "\<C\>" ideas.txt

      egrep -i "^ACT|^Scene" hamlet.txt


Slide 8:
      egrep "\^_?\^" chat.txt  


Slide 10:
      egrep "[ABCDF][+\-]?" 143.txt


Slide 11:
      egrep "\(206\) [0-9]{3}-[0-9]{4}" faculty.html 


Slide 14:
      sed -r "s/([0-9]{3})-([0-9]{4})/(206) \1\.\2/g" faculty.html
      

Slide 16:
      #!/bin/bash

      YEAR=2011
      for FILE in `cat files.txt`; do
      	    sed -r "s#([0-9]{1,2})/([0-9]{1,2})#\1/\2/$YEAR#g" $FILE
      done