regex - How to add a rewrite condition to only pass URL's with one folder depth? -

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i have rewrite rule needs applied urls go no further in depth 1 folder 

example.com/a  >> rewrite me

and not

example.com/a/b  >> don't rewrite me

so need rewrite urls depth of 1. greater depth allowed needs go through unaltered.

how doing mod_rewrite condition statement? , can have personal rewrite rule written. thank you!

rewriteengine on  # matches urls equal to: "", "<text>", or "<text>/" # if matches, rewrite engine not attempt match more patterns rewriterule ^[^/]*/?$ - [l]  # if above doesn't match, meaning it's depth more one, # forbids content being delivered rewriterule .* - [f]

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