I'm converting my urls extension from .php to .html in my .htaccess:
RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} (.).php
RewriteRule ^(.*).php $1.html [R=301,L]
RewriteRule ^(.*).html $1.php [L]
FallbackResource /index.php
The problem is that I have some section with the word "php" on it:
www.mywebsite.com/phpscripts.php
And when it is converted:
www.mywebsite.com/htmlscripts.html
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^(.*).php
This regex says: anything, including nothing, followed by a single arbitrary character, followed by "php". For example, it'll match "blahphp.html", specifically it'll match the "blahphp" part and not care about the extension at all.
What you're looking for is this:
RewriteRule (.+)\.php$ $1.html [R=301,L]
RewriteRule (.+)\.html$ $1.php [L]
(.+)\.php$ is something (at least one character) followed by a period followed by "php" at the end of the string. You can also get rid of the RewriteCond, it doesn't add anything to these rules.
Also note that you should be changing all your HTML files to link to href="...html". Don't rely on these redirects alone to fix your problem; not only is it inefficient to redirect every single request, it'll also break POST requests. It's only acceptable to redirect clients which try to open the old URLs for whatever reason to the new canonical URLs.
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