I have an old site that is being rebuilt. Instead of using a folders structure, it is using sub-domains. The segments are different, but the redirect itself is pretty simple. I can handle it like so:
RewriteRule ^segment/blog/view$ http://blogs.site.com/segment/article [R=301,NE,NC,L]
RewriteRule ^segment/blog$ http://blogs.site.com/segment [R=301,NE,NC,L]
So if I had www.site.com/segment/blog, it will now go to blogs.site.com/segment. If I had www.site.com/segment/blog/view/catchy_name_goes_here, currently it redirects it to blogs.site.com/segment/article/catchy_name_goes_here and I NEED it to go here: blogs.site.com/segment/article/catchy-name-goes-here.
My issue comes from a decision to change the separator in the URI. The old articles were built with underscores '_' and the new articles are built with hyphens '-'.
How can I replace the underscores in the article titles with hyphens?
I ended up having to use the following. I don't know how many people this might effect due to the unique settings for this site in particular, but thought I would post the answer so it could help anyone that might need it.
The full settings on this are a server running IIS with Server 2k. The site consists of several static content pages, vb script, classic ASP, dot Net, and this is all intertwined with ExpressionEngine pages. It's a mess to say the least. To top it off, Helicon Tech's ASAPI Rewrite Module version 3 is running on the server for .htaccess usage. No sub-expressions, groupings, etc. were taking or being followed/processed. The index.php rule was getting bypassed as well.
This all said, I ended up with the following which parsed everything I needed.
RewriteRule ^index.php/segment/blog/view/([^_]*)_+(.*)$ http://www.site.com/index.php/segment/blog/view/$1-$2 [R,NC]
RewriteRule ^index.php/segment/blog/view/([^_]*)$ http://blogs.site.com/segment/article/$1 [R=301,I,L,U]
RewriteRule ^segment/blog$ http://blogs.site.com/segment [R=301,NE,NC,L]
RewriteRule ^/segment/blog$ http://blogs.site.com/segment [R,I,L]