regex - How can I redirect all visitors to a subdirectory but still have access to the root directory for development -

i'm start building site , i've set "under construction" site @ http://positivechange.cl

i'd work directly on root directory during development don't have move files development subdirectory root directory, i'd redirect users http://positivechange.cl/maintenance

after searching online know how redirect subdirectory using redirectmatch ^/$ /subdirectory/ on .htaccess file, doesn't allow me access root directory , check how site going.

is there way this?

you can use code in document_root/.htaccess file:

rewriteengine on  rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewritecond %{query_string} !(^|&)dev=1(&|$) [nc] rewriterule !^maintenance\.html$ maintenance.html [l,nc] 

key use of query parameter dev=1. without query parameter site show maintenance.html. if add ?dev=1 url can access development website.