php - htaccess mod_rewrite, one syntax works, but other no -

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when write in .htaccess mod_rewrite

 rewriteengine on  rewriterule ^(.*)\.my_extension$ $1.php

this wroks fine.

but when trying mod_rewrite this:

rewriteengine on rewriterule ^(.*)$ index.php?url=$1

this gives me internal server error when open address, example site.com/somepage

so, may reason of this?

rewriteengine on rewritecond %{request_uri} !(index.php) rewriterule ^(.*)$ index.php?url=$1

you have redirect loop, need exclude index.php rules.


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