Using grep with regular expression to filter out matches

Question

I\'m trying to use grep with -v for invert-match along with -e for regular expression. I\'m having trouble getting the syntax right.

I\'m trying something like

Answer 1

You need to escape the pipe symbol when -e is used:

tail -f logFile | grep -ve "string one\|string two"

EDIT: or, as @Adam pointed out, you can use the -E flag:

tail -f logFile | grep -vE "string one|string two"