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1. If http://example.com/foo/bar does not exist, redirect to http://other.example.com/foo/bar. (Put this in an .htaccess file in your top-level web directory.)

   # .htaccess in root of example.com
   RewriteEngine On
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.*)$ http://other.example.com/$1 [R]

2. Handle all requests for top-level .html files and files with no extensions (http://example.com/foo, http://example.com/foo.html) with a single PHP program /foo/show.php. Also, ignore trailing characters in set { : ; , . } so URLs like "http://example.com/foo." can be copied-n-pasted from plain text sentences by inattentive users.

   # .htaccess in root of example.com
   RewriteRule ^/?([^/]*\.html?|[^\./]*)[:;,\.]*$ /foo/show.php [L,NS]

   Examples:

   http://tomclegg.net/rewriterule
   http://tomclegg.net/rewriterule.html;

3. Redirect GET requests for http://example.com/foo/bar to http://example.com/bar (and /foo/bar.html to /bar.html). Handle POST requests with PHP program rather than attempting to redirect a POST (which is unlikely to work well).

   # .htaccess in foo folder in example.com's document root
   RewriteEngine On
   RewriteCond %{REQUEST_METHOD} GET
   RewriteRule ^/?([^/]*\.html?|[^\./]*)[:;,\.]*$ /$1 [R,L,NS]
   RewriteCond %{REQUEST_METHOD} POST
   RewriteRule ^/?([^/]*\.html?|[^\./]*)[:;,\.]*$ /foo/show.php [L,NS]

   Examples:

   http://tomclegg.net/w/rewriterule
   http://tomclegg.net/w/rewriterule.html;