wordpress - htaccess redirect goes to wrong URL -

i have setup following rules in .htaccess:

<ifmodule mod_rewrite.c>     rewriteengine on     rewritebase /      // redirect old blog urls new location     rewritecond %{http_host} ^www.objectsanduse.com/blog/$     rewriterule ^(.*)$ http://www.objectsanduse.com/$1 [r=301,l]      // wordpress rewrite rules     rewriterule ^index\.php$ - [l]     rewritecond %{request_filename} !-f     rewritecond %{request_filename} !-d     rewriterule . /index.php [l] </ifmodule> 

the url http://www.somedomain.com/blog/2016/01/19/some-post/ redirects correctly http://www.somedomain.com/2016/01/19/some-post/

but http://www.somedomain.com/blog redirects http://www.somedomain.com//2015/03/30/some-other-post

if have understood correctly need single rule:

rewriterule ^(blog\/?)(.*) http://%{http_host}/$2 [r=301,l] 

this rule takes old uri starting blog (optionally followed /)

and captures follows (where includes "nothing @ all").

then rewrites uri, containing second capture group without preceding blog/.