mydomain.com/?L=registration.register

i've looked and tried but haven't been able to find a way to use .htaccess to re-write the above URL and like URLs as such

mydomain.com/registration/register

or

mydomain.com/registration/


the same for such URLs like mydomain.com/?L=search.users

currently turkish hackers (as they call themselves) are searching for URLs with the ?L within it. there is a security exploit within the CMS I'm using and frankly this is getting tiresome.

Any and every bit of help is appreciated.

Thank you

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