I added this rule
RewriteRule ^(.*)-[0-9]+/$ /$1/ [L,QSA]
to remove a trailing number preceded by a hyphen from an url on a WordPress site
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^(.*)-[0-9]+/$ /$1/ [L,QSA]
</IfModule>
But it doesn't seem to do the trick, to me the regex seems ok but I presume it conflicts with the other rules