Sed \w character class not working with replace on mac

问题

When I execute this command on OSX, I would expect each letter to be replaced by an "x", but none of the letters are replaced:

$ echo 'a b c' | sed 's/\w/x/g'

output: a b c

This works just fine:

echo 'a b c' | sed 's/[[:alpha:]]/x/g'

output: x x x

What am I missing?

回答1:

Please note that the BSD implementation of sed on Mac is different from other linux machines

You can install gnu sed. Run the following command on Apple Mac OS:

$ brew install gnu-sed

reference: https://www.cyberciti.biz/faq/how-to-use-sed-to-find-and-replace-text-in-files-in-linux-unix-shell/

来源：https://stackoverflow.com/questions/59447514/sed-w-character-class-not-working-with-replace-on-mac