Options +FollowSymlinks
RewriteEngine on
 
# Redirection msie (MS IE < 11 - otherwize "desktop" is used)
Rewritecond %{http_host} ^example.com [nc]
RewriteCond %{HTTP_USER_AGENT} "MSIE"
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/iphone
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/wp
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/msie
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/desktop
RewriteRule ^(.*)$ /my-path-from-web-root/msie/$1 [NC,L]

# Redirection Windows Phone devices
Rewritecond %{http_host} ^example.com [nc]
RewriteCond %{HTTP_USER_AGENT} "Windows Phone"
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/iphone
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/wp
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/msie
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/desktop
RewriteRule ^(.*)$ /my-path-from-web-root/wp/$1 [NC,L]

# Redirection iPhone or iPad devices
Rewritecond %{http_host} ^example.com [nc] 
RewriteCond %{HTTP_USER_AGENT} iPhone|iPad
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/iphone
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/wp
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/msie
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/desktop
RewriteRule ^(.*)$ /my-path-from-web-root/iphone/$1 [NC]
 
# Redirection Android devices
Rewritecond %{http_host} ^example.com [nc] 
RewriteCond %{HTTP_USER_AGENT} Android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/iphone
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/wp
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/msie
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/desktop
RewriteRule ^(.*)$ /my-path-from-web-root/android/$1 [NC]

# Redirection for everything not identfied as before (fallback is "desktop")
Rewritecond %{http_host} ^example.com [nc]
RewriteCond %{HTTP_USER_AGENT} ^(?:(?!iPhone|iPad|Android|Phone).)*$
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/android
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/iphone
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/wp
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/msie
RewriteCond %{REQUEST_URI} !\/my-path-from-web-root\/desktop
RewriteRule ^(.*)$ /my-path-from-web-root/desktop/$1 [NC]