htaccess remove the parameter from url

Question

I am trying to remove certain url parameters from the urls. Those parameters have no effect on the content being displayed anymore, but google have a bunch of them indexed.

Answer 1

You can use this rule to strip all query strings except when param3= is found in it.

RewriteEngine On

RewriteCond %{QUERY_STRING} .
RewriteCond %{QUERY_STRING} !(?:^|&)param3= [NC]
RewriteRule ^ %{REQUEST_URI}? [R=301,L,NE]