301 redirect old parameter names to new parameter names by htaccess - apache

Question

I just changed two parameter names and wanna redirect old names to changed name ones with any values anywhere in URL. e.g:
product.php?colornew=anyvalue&productname=anyvalue
301 redirect to:
product.php?color=anyvalue&product=anyvalue
Please note that this is just an example and as I said these two parameter can be anywhere in URL with any value.

Answer 1

You can use this code to rename your query parameters in any URL:
RewriteEngine On
# rename query parameter colornew=>color
RewriteCond %{QUERY_STRING} ^(.*&)?colornew=([^&]*)(&.*)?$ [NC]
RewriteRule ^ %{REQUEST_URI}?%1color=%2%3 [NC]
# rename query parameter productname=>product
RewriteCond %{QUERY_STRING} ^(.*&)?productname=([^&]*)(&.*)?$ [NC]
RewriteRule ^ %{REQUEST_URI}?%1product=%2%3 [NC,NE,L,R=302]

Answer 2

Try :
RewriteEngine on
RewriteCond %{THE_REQUEST} \?colornew=([^&]+)&productname=([^&\s]+)
RewriteRule ^ %{REQUEST_URI}?color=%1&product=%2 [QSA,NC,NE,L,R=301]

Answer 3

A simple fix of anubhava's otherwise excellent answer:
RewriteEngine On
# rename query parameter colornew=>color
RewriteCond %{QUERY_STRING} ^(.*&)?colornew=([^&]*)(&.*|)$ [NC]
RewriteRule ^ %{REQUEST_URI}?%1color=%2%3 [NC]
# rename query parameter productname=>product
RewriteCond %{QUERY_STRING} ^(.*&)?productname=([^&]*)(&.*|)$ [NC]
RewriteRule ^ %{REQUEST_URI}?%1product=%2%3 [NC,NE,L,R=302]
The difference is, at the end of the rewrite condition, the question mark is removed and there is an added "or" operator: |.
The reason is that, without this change, the URL becomes product.php?color=anyvalue&product=anyvalue%3 when there is nothing filled by the final match - (&.*)? - because the question mark in that match section says it either exists or doesn't; and if it doesn't, %3 doesn't exist so it just becomes appended as a string. Instead, (&.*|) says the match can either be populated by an ampersand plus anything, or it can be populated by nothing. In this way, %3 becomes "" when there is nothing and %3 does not get appended to the string.