You forgot the regex begin tag on this line:

Other than that, they look fine...you may also want to add a [L] after each rule, so that other rules following that line will not be processed (if you have another directive at the end of the rule -- like QSA -- that becomes [QSA,L]). Also, you might want to put the lines in the order of their usage, for apache to work less, therefore increasing the loading speed of your pages. But these are just minor tweaks.

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