Lecture 7 (Regular Expressions) Exercise answers:

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

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


Slide 8:
      egrep "\^_?\^" chat.txt  
      -or-  
      egrep"(^| |\t)\^_?\^( |\t|$)" chat.txt


Slide 10:
      egrep "[ABCDF][+\-]?" 143.txt
      -or-
      export LC_ALL=C
      egrep "[A-D,F][+-]?" 143.txt


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


Slide 14:
      sed -r "s#([0-9]{3})-([0-9]{3})-([0-9]{4})#(\1) \2.\3#g" facnames.txt


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