Can -v be used with regex?

Yes, the -v option in the grep command can be used with regular expressions. When you use -v along with a regex pattern, grep will display all lines that do not match the specified regex pattern.

For example, if you want to exclude lines that contain any digits from a file, you can use the following command:

grep -v "[0-9]" filename.txt

In this case, grep will output all lines from filename.txt that do not contain any numeric characters. This allows for powerful filtering based on complex patterns defined by regular expressions.