I can't do this serverside because it has to parse in the .htaccess first. Basically, I have the following string: RewriteRule ^([A-Za-z0-9_]+)$ index.php?word=$1 which makes: mysite.com/this go to mysite.com/index.php?word=this But, if someone puts in mysite.com/what is this it will error out.  I want it to convert all the ...