[SOLVED] Htaccess - Combining underscore to hyphen and uppercase to lowercase 301 redirect

Issue

At the moment I'm using an underscore the hyphen 301 on my site, this is working well but I also want to convert all links to lowercase and add an uppercase to lower case rewrite.

I can do this but with the current method it would do the following which I don't think would be very good for SEO:

1. Original URL
2. 301
3. Hyphen Replaced
4. 301
5. Hyphen Lowercase URL

How can I combine the following rewrites into one query so that urls with either underscores or uppercase are converted to hyphens and lowercase via a 301?

Underscore to Hyphens rewrite

RewriteRule ^post/([^_]*)_([^_]*_.*)$ /posts/new-category-1/$1-$2 [L,NE]
RewriteRule ^post/([^_]*)_([^_]*)$ /posts/new-category-1/$1-$2 [L,NE,R=301]

RewriteRule ^forum/([^_]*)_([^_]*_.*)$ /forums/new-category-1/$1-$2 [L,NE]
RewriteRule ^forum/([^_]*)_([^_]*)$ /forums/new-category-1/$1-$2 [L,NE,R=301]

Uppercase to Lowercase rewrite

httpd.conf

RewriteMap lc int:tolower

.htaccess

RewriteCond %{REQUEST_URI} ^[^A-Z]*[A-Z].*
RewriteRule ^ ${lc:%{REQUEST_URI}} [L,R=301]

Solution

You can avoid multiple 301 by having rules like this:

RewriteRule ^(post|forum)/([^_]*)_([^_]*_.*)$ /$1/$2-$3 [L,NE]

# if there is any upper case letter then do both lowercase conversion AND
# underscore to hyphen replacement
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule ^(post|forum)/([^_]*)_([^_]*)$ /${lc:$1}/${lc:$2}-${lc:$3} [L,NE,R=301]

# otherwise regular underscore to hyphen replacement
RewriteRule ^(post|forum)/([^_]*)_([^_]*)$ /$1/$2-$3 [L,NE,R=301]

# and regular lower case conversion
RewriteRule ^(post|forum)/[^A-Z]*[A-Z] ${lc:%{REQUEST_URI}} [L,R=301]

Answered By - anubhava