我的网站的一个旧的URL结构是这样的：

https://example.com/login.php
    or, 
    https://example.com/login.php?redirect=https://example.com
    or,
    https://example.com/register.php

重建URL后，URL如下所示：

https://example.com/login
    or, 
    https://example.com/login?redirect=https://example.com
    or,
    https://example.com/register

现在，当用户/访客使用旧的URL https://example.com/login.php时，我想重定向到https://example.com/login页面。我该怎么做呢？
仅供参考，目前，我的.htaccess文件包含以下内容：

AddDefaultCharset UTF-8

ErrorDocument 404 /error-404/

##
Options +FollowSymlinks -MultiViews
RewriteEngine on
RewriteBase /

## Allow a few SEO Files direct access.
RewriteRule ^robots.txt?$ robots.txt [L]
RewriteRule ^ads.txt?$ ads.txt [L]
RewriteRule ^sellers.json?$ sellers.json [L]

## Avoid rewriting rules for the admin section
RewriteRule ^(admin|resources)($|/) - [L]

## Set Ajax Request File
RewriteRule ^kahuk-ajax.php?$ kahuk-ajax.php? [L,QSA]

## Set controller with id
RewriteRule ^([^/]+)/([0-9]+)/?$ index.php?con=$1&id=$2 [L,QSA]

## Set controller with slug
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?con=$1&slug=$2 [L,QSA]

## For paging
RewriteRule ^([^/]+)/page/([0-9]+)/?$ index.php?con=$1&page=$2 [L,QSA]
RewriteRule ^([^/]+)/([^/]+)/page/([0-9]+)/?$ index.php?con=$1&slug=$2&page=$3 [L,QSA]

## Set controller for only one parameter
RewriteRule ^page/([^/]+)/?$ index.php?con=page&slug=$1 [L,QSA]
RewriteRule ^([^/]+)/?$ index.php?con=$1 [L,QSA]

## Set home page
RewriteRule ^/?$ index.php?con=home [L]