cat ideas.txt 
egrep "C" ideas.txt 
egrep "C\>" ideas.txt 
egrep "\<C\>" ideas.txt 

less hamlet.txt
egrep "act" hamlet.txt 
egrep "Act" hamlet.txt 
egrep "\<Act" hamlet.txt 
egrep -i "\<Act" hamlet.txt 
egrep -i "\<Act\>" hamlet.txt 
egrep -i "^Act\>" hamlet.txt 
egrep -i "scene" hamlet.txt 
egrep -i "^scene" hamlet.txt 
egrep -i "^Act\>|^Scene" hamlet.txt

cat chat.txt 
egrep "\^" chat.txt 
egrep "\^\^" chat.txt 
egrep "\^_\^" chat.txt 
egrep "\^.*\^" chat.txt 
egrep "(\^\^|\^_\^)" chat.txt 
egrep "\^_?\^" chat.txt 

cat 143.txt 
egrep "[ABCDF]" 143.txt 
egrep "[A-DF][+\-]?" 143.txt 
egrep "[A-DF][+\-]?$" 143.txt 

cat faculty.html 
egrep "[0-9]" faculty.html 
egrep "\([0-9]" faculty.html 
egrep "\([0-9]{3}" faculty.html 
egrep "\([0-9]{3}\)" faculty.html 
egrep "\([0-9]{3}\) [0-9]{3}" faculty.html 
egrep "\([0-9]{3}\) [0-9]{3}-[0-9]" faculty.html 
egrep "[0-9]{3}-[0-9]{4}" faculty.html 

sed -r "s/Jones/Anderson/g" names.txt
sed -r "s/Jones/Anderson/" names.txt

egrep "([A-Za-z]+), \1" names.txt

sed -r "s/([0-9]{3})-([0-9]{4})/\1\.\2/g" faculty.html 
sed -r "s/([0-9]{3})-([0-9]{4})/\1\.\2/g" faculty.html > faculty2.html