301 Redirect to replace all spaces to hyphens

So here's my problem. I took over a site that has has a bunch of pages indexed that have %20 indexed in Google. This is simply because the person decided to just use the tag name as the title and url slug. So, the urls were something like this:

http://www.test.com/tag/bob%20hope
http://www.test.com/tag/bob%20hope%20is%20funny

I have added a new field for the url slug and string replaced all spaces with dashes. While I have no problem linking to these new pages and getting the data, I need to 301 redirect the old URLs to the new URLs, which would be something like:

http://www.test.com/tag/bob-hope
http://www.test.com/tag/bob-hope-is-funny

So, it needs to be able to account for multiple spaces. Any questions? :)

Solution 1:

Use these rules in your .htaccess file:

Options +FollowSymlinks -MultiViews
RewriteEngine on
RewriteBase /

# keep replacing space to hyphen until there is no space use internal rewrite
RewriteRule ^([^\s%20]*)[\s%20]+(.*)$ $1-$2 [E=NOSPACE:1]

# when there is no space make an external redirection
RewriteCond %{ENV:NOSPACE} =1
RewriteRule ^([^\s%20]+)$ $1 [R=301,L]

This will replace all space characters (\s or %20) to hyphen -

So a URI of /tag/bob%20hope%20is%20funny will become /tag/bob-hope-is-funny with 301

Brief Explanation: If there are more than 1 space in URI then 1st RewriteRule is fired recursively replacing each space character with hyphen - until there is no space left. This rule will only rewrite internally.

Once no space is left 2nd RewriteRule is fired which just uses a 301 redirect to the converted URI.

Solution 2:

Building on @anhubhava's answer, it's close, but that will also match %,2 or 0 in the URL, and it can cause a loop on apache 2.2 if you don't use the DPI parameter. The full script should look like this:

Options FollowSymlinks MultiViews
RewriteEngine on
RewriteBase /

# keep replacing space to hyphen until there is no space use internal rewrite
RewriteRule ^([^\s%20]*)(?:\s|%20)+(.*)$ $1-$2 [N,E=NOSPACE:1,DPI]

# when there is no space make an external redirection
RewriteCond %{ENV:NOSPACE} =1
RewriteRule ^([^\s%20]+)$ $1 [R=301,L]

I've also added the N (Next) parameter as this then forces the rules to be re-evaluated from the start straight after this rule if it matches. If this isn't there, you can get problems if you're using apache as a reverse proxy as it's unlikely that it'll get to the end of the rewrites before something else happens.