SED/AWK/PERL(GNU userland) - how to substitute pattern A but not pattern B?

Question

First, I am using GNU userland so you can assume I use Bash, GNU coreutils...

I have a HTML and I want to change all

href="foobarz"

into

href=""

However, I don't want to change any line containing the word css (not case-sensitive)

'href="fooCsSbarz"'

should remain unchanged

I am currently using the command

$ cat foo.html | sed -e 's/href="[^"]*"/href=""/g' > bar.html

but it cannot retain those lines containing the word css (not case-sensitive)

Actually, any tool available in *nix is welcomed, like sed, awk, perl...

Thank for your help!

Answer 1

From here.

You can use:

sed '/[Cc][Ss][Ss]/! s/href="[^"]*"/href=""/g' foo.html > bar.html