TOPIC: FORMAL LANGUAGES
WordPress URL management with canonical tags and permalink simplification
29th March 2025Recently, I have been going through the content, rewriting things where necessary. In the early days, there were some posts following diary and announcement styles that I now avoid. Some now have been moved to a more appropriate place for those, while others have been removed.
While this piece might fall into the announcement category, I am going to mix up things too. After some prevarication, I have removed dates from the addresses of entries like this after seeing some duplication. Defining canonical URL's in the page header like this does help:
<link rel="canonical" href="https://technologytales.com/an-alternate-approach-to-setting-up-a-local-git-repository-with-a-remote-github-connection/">
However, it becomes tricky when you have zero-filled and non-zero-filled dates going into URL's. Using the following in a .htaccess file redirects the latter to the former, which is a workaround:
RewriteRule ^([0-9]{4})/([1-9])/([0-9]{1,2})/(.*)$ /$1/0$2/$3/$4 [R=301,L]
RewriteRule ^([0-9]{4})/(0[1-9]|1[0-2])/([1-9])/(.*)$ /$1/$2/0$3/$4 [R=301,L]
The first of these lines zero-fills the month component, while the second zero-fills the day component. Here, [0-9]{4} looks for a four digit year. Then, [1-9] picks up the non-zero-filled components that need zero-prefixing. The replacements are 0$2 or 0$3 as needed.
Naturally, this needs URL rewriting to be turned on for it to work, which it does. Since my set-up is on Apache, the MOD_REWRITE module needs to be activated too. Then, your configuration needs to allow its operation. With dates removed from WordPress permalinks, I needed to add the following line to redirect old addresses to new ones for the sake of search engine optimisation:
RedirectMatch 301 ^/([0-9]{4})/([0-9]{2})/([0-9]{2})/(.*)$ /$4
Here, [0-9]{4} picks up the four digit year and [0-9]{2} finds the two-digit month and day. The, (.*) is the rest of the URL that is retained as signalled by /$4 at the end. That redirects things nicely, without my having to have a line for every post on the website. Another refinement was to remove query strings from every page a visitor would see:
RewriteCond %{REQUEST_URI} !(^/wp-admin/|^/wp-login\.php$) [NC]
RewriteCond %{QUERY_STRING} .
RewriteCond %{QUERY_STRING} !(&preview=true) [NC]
RewriteRule ^(.*)$ /$1? [R=301,L]
This still allows the back end and login screens to work as before, along with post previews during the writing stage. One final note is that I am not using the default login address for the sake of added security, yet that needs to be mentioned nowhere in the .htaccess file anyway.