How To 301 Redirect Queries?

I have just upgraded my website, and set 301 redirects for all old pages.

But on the old website I used a search engine, and in Google Webmaster there are loads of 404 pages with search queries. They look like this: www.mydomain.com/search.php?filter=monitor&q=merchant&sort=price

Simply redirecting search.php doesn't help, so I guess I need to use a wildcard?
I have never done anything like this, so maybe someone can tell me how to do this?

Thanks!

 

Try using this:

RewriteEngine On
RewriteCond %{QUERY_STRING} ^filter=(.*)&q=(.*)&sort=(.*)$ [NC]
RewriteRule ^search.php$ /your-new-search-url/filter-%1/q-%2/sort-%3/? [L,R=301]

Code (markup):

Above snippet will redirect all your search queries to your new url along with entered parameters. So in the line 3 you need to change the last part to your actual url. In the case you just want to redirect all those pages and cut off old queries then replace line 3 with this one:

RewriteRule ^search.php$ /your-new-search-url/? [L,R=301]

Code (markup):

 

That works. Thanks!