Find and replace text in file with Regex

#!/bin/bash
# Find and change text in file with "sed"
# https://unix.stackexchange.com/questions/159367/using-sed-to-find-and-replace
# http://www.thegeekstuff.com/2009/09/unix-sed-tutorial-replace-text-inside-a-file-using-substitute-command/?utm_source=sitekickr&utm_medium=snip_button
DIRS=`ls -l "." | egrep '^d' | awk '{print $9}'`

for DIR in $DIRS
do
	FILE=$DIR"/wp-config.php"
  sed -i -e "s/define('DB_PASSWORD',.*);/define('DB_PASSWORD', 'root');/g" $FILE
  sed -i -e "s/define('DB_USER',.*);/define('DB_USER', 'root');/g" $FILE
done