Enable mod_rewrite and .htaccess through httpd.conf
and then put this code in your .htaccess
under DOCUMENT_ROOT
directory:
Options +FollowSymLinks -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /
RewriteRule ^alternative-url-web2(/.*|)$ /web2$1 [L,NC]
Alternate code:
RewriteRule ^alternative-url-web2/?$ /web2/ [L,NC]
RewriteRule ^alternative-url-web2/(.+)$ /web2/$1 [L,NC]