使用.htaccess重写查询字符串中的变量

Question

I use a PHP script with my site that produces a querystring in the URL. One of the variables in the querystring is: colour=red

I would like to make a rule in my .htaccess file that re-writes all instances of colour=red to colour=blue .

I don't have access to change the original PHP script so a .htaccess rule is needed.

Answer 1

RewriteEngine On
RewriteCond %{QUERY_STRING} ^(.*&|)colour=red(&.*|)$  # search colour=red
RewriteRule ^(.*)$ $1?%1colour=blue%2 [L,R=301]       # redirect to colour=blue

This will redirect URLs with colour=red in query-string to URLs with colour=blue