How many developers you work with know how to search/navigate the code base effectively? How many of them know and use regular expressions when ever they can? H

How many developers you work with know how to search/navigate the code base effectively? How many of them know and use regular expressions when ever they can? How many of them feel really comfortable with find/xarg/(e)grep? How many of them know advanced editor like vim/emacs? How many of them know that there is something like pentadactyl for firefox? I thought so. So, I can't really say I'm surprised that 90% of people don't know how to search either.