How to make a redirect to the main page of the site in .htaccess if there are utm_source GET parameters?

Question

htaccess

Have a domain mysite.com
Want all URL requests like
mysite.com? utm_source =mymetka
redirected to
mysite.com
Thank you all in advance!

Answer 1

Why exactly? Search engines don't count them.
And so the option:

RewriteCond %{QUERY_STRING} ^utm_source= [NC]
RewriteRule (.*) $1? [R=301,L]

Another option:

RewriteEngine on
RewriteCond %{QUERY_STRING} ^((.*?)&|)utm_
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1?%2 [R=301,NE,L]

Or in robots
Disallow: /*utm_*=

Answer 2

read about QSA flags