sed command edit multi files ( insert , replace line)

Question

Ive 30 files named ( db01.php up to db30.php )

include this line

     require_once('config.php');

I want to add or replace it to be

    require_once('../new/config.php');

how to use sed to edit these 30 files at once

Answer 1

sed -i 's/\(require_once(.\)\(config\.php.);\)/\1..\/new\/\2/' db*.php