grep "chocolate" candies.txt
less faculty.html 
grep "@" faculty.html 
clear
grep -E "[a-zA-Z0-9_\-]+@(([a-zA-Z0_\-])+\.)+[a-zA-Z]{2,4}" faculty.html 
grep -oE "[a-zA-Z0-9_\-]+@(([a-zA-Z0_\-])+\.)+[a-zA-Z]{2,4}" faculty.html 
clear
grep -E "sour" candies.txt
grep -E ".oo." candies.txt
grep -E -i "^chocolate" candies.txt
grep -E -i "y$" candies.txt 
grep -E -i "^chocolate$" candies.txt
grep -E -i "\<c" candies.txt 
grep -E -i "y\>" candies.txt 
grep -E -i "(kitkat)" candies.txt
grep -E -i "(k|m|p)at" candies.txt
grep -E -i "kitkat | twix" candies.txt
grep -E -i "gummy bears|worms|candy" candies.txt
grep -E -i "kit*" candies.txt
grep -E -i "thai.*om" restaurants.txt 
grep -E -i "kit+" candies.txt
grep -E -i "kit ?kat" candies.txt
grep -E -i ".(es)+" candies.txt
grep -E -i "o{2}" candies.txt
grep -E -i "(e|o){2}" candies.txt
grep -E "a|b|c|d|e|f|g|h" candies.txt
grep -E "[a-h]" candies.txt
grep -E "[a-z]" candies.txt
grep -E "^[a-z]$" candies.txt
grep -E "^[a-z]+$" candies.txt
grep -E "^[A-Z]+$" candies.txt
grep -E "^[a-zA-Z]+$" candies.txt
grep -E "[0-9]" candies.txt
grep -E "[0-9]0" candies.txt
grep -E "[0-9]{2}" candies.txt
grep -E "[a-zA-Z]{2}" candies.txt
grep -E "(.)\1" candies.txt
grep -E "(.)(.)\2\1" candies.txt