grep and regular expression

http://www.thegeekstuff.com/2011/01/advanced-regular-expressions-in-grep-command-with-10-examples-%E2%80%93-part-ii/

http://www.cyberciti.biz/faq/grep-regular-expressions/

grep more than one word

http://rajaseelan.com/2009/07/04/how-to-search-grep-for-more-than-one-word-at-a-time/

Ignore binary files

grep -I (capitol i)