How to shorten a link in htaccess?

Question

htaccess

Please help to shorten these links in htaccess, leaving only the last numbers, to this form (/2498)
/index.php?page=catalog&cat=2498
The numbers in each heading change, but the path does not change.

Answer 1

RewriteCond %{QUERY_STRING} (^|&)cat\=([0-9]{1,})($|&)
#СООТВЕТСТВЕННО ЦИФРЫ МОЖНО ЗАМЕНИТЬ РЕГУЛЯРКОЙ НАПРИМЕР [0-9]{1,} В ТАКОМ СЛУЧАЕ ЭТО БУДЕТ ЦИФРЫ ОТ 1 ШТУКИ И БОЛЬШЕ
RewriteRule ^(.*) /%2? [L,R=301]

And even better, write an example of a link which one was which one, you can have several pieces, I will make a clearer regular expression.