[CentOS] replace multiple string

Hi


I would like to use a bash script that searches files and
subdirectories name in a directory /var/ww/html/web
for a specific string, and when it finds the search string, replaces
the string (old1) with new string (new1), and so on
old2 with new2 ....oldn with newn.



replace_string.sh
#!/bin/bash
for db in $(find /var/www/html/web -name * -exec)
do
  sed -e "s/old1/new1/" \
  sed  -e "s/old2/new2/" \
...
  sed -e "s/oldn/newn/" $db
done

Any recommendation..

Thanks
pons