Rewrite URL containing … in htaccess

Question

Sometimes I find that URLs on my website show up with mywebsite_smf_smf1_session= .

For example:

http://mywebsite.com/index.php​?mywebsite_smf_smf1_session=6goevo28​vf18ubqgb5uh6r08b2&topic=332242​.msg916981

http://mywebsite.com/index.php​?mywebsite_smf_smf1_session=6gqvo88l​u5fnl1qmj7temt0113&topic=316196​.msg931242

The part that contains mywebsite_smf_smf1_session=### shouldn't be in the URL, but the link still redirects to the correct page.

I would like to know how I can use mod_rewrite in .htaccess so that when someone clicks a URL containing mywebsite_smf_smf1_session=###& , it automatically reverts to the version not containing it:

Clicking:

http:// mywebsite.com/index.php​?mywebsite_smf_smf1_session=6gqvo88l​u5fnl1qmj7temt0113&topic=316196​.msg931242

Becomes:

http:// mywebsite.com/index.php​?topic=316196​.msg931242

Answer 1

You can use this rule in your DOCUMENT_ROOT/.htaccess file:

RewriteEngine On

RewriteCond %{QUERY_STRING} ^mywebsite_smf_smf1_session=[^&]*(?:&(.*))?$ [NC]
RewriteRule ^index\.php$ %{REQUEST_URI}?%1 [NE,L,NC,R=302]