php - How to put a trailing slash from a mod rewrite -

i'm having problem using rewrite:

rewritecond %{http_host} www.example.com$ rewriterule ^(.*)$ http://example.com$1 [r=301,l]  

to remove www url

but return url without trailing slash. example: example.com/subfolder supposedly has url of example.com/subfolder, result example.comsubfolder whch breaks url. me solving this? many thanks!

edit: here's whole .htaccess

header unset pragma fileetag none header unset etag  # 1 year <filesmatch "\.(ico|pdf|flv)$"> header set cache-control "max-age=29030400, public" </filesmatch> # 1 week <filesmatch "\.(jpg|jpeg|png|gif|swf)$"> header set cache-control "max-age=604800, public" </filesmatch> # 2 days 172800 <filesmatch "\.(xml|txt|css|js)$"> header set cache-control "max-age=604800, proxy-revalidate" </filesmatch> # 1 min <filesmatch "\.(html|htm)$"> header set cache-control "max-age=60, private, proxy-revalidate" </filesmatch>  <filesmatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$"> header set expires "thu, 15 dec 2011 20:00:00 gmt" </filesmatch>  rewriteengine on  rewritecond %{query_string} (^|\?)f=([0-9]+)&t=([0-9]+)($|&) rewriterule ^viewtopic\.php$ /index.php?threads/%3/ [r=301,l]  rewritecond %{query_string} (^|\?)f=([0-9]+)($|&) rewriterule ^viewforum\.php$ /index.php?forums/%2/ [r=301,l]  rewritecond %{http_host} www.example.com$ rewriterule ^(.*)$ http://example.com/$1 [r=301,l]   # use php5.4 single php.ini default addhandler application/x-httpd-php54s .php # # uncomment statement below if want make use of # http authentication , not work. # required if example using php via apache cgi. # ## expires caching ##  <ifmodule mod_expires.c>  # enable expirations expiresactive on  # default directive expiresdefault "access plus 1 month"  # favicon expiresbytype image/x-icon "access plus 1 year† # images expiresbytype image/gif "access plus 1 month" expiresbytype image/png "access plus 1 month" expiresbytype image/jpg "access plus 1 month" expiresbytype image/jpeg "access plus 1 month"  # css expiresbytype text/css "access 1 month† # javascript expiresbytype application/javascript "access plus 1 year"  </ifmodule>  ## expires caching ## #<ifmodule mod_rewrite.c> #rewriteengine on #rewriterule .* - [e=http_authorization:%{http:authorization},l] #</ifmodule>  <files "config.php"> order allow,deny deny </files>  <files "common.php"> order allow,deny deny </files> directoryindex portal.php index.php index.html index.htm  rewritecond %{http_referer} !^http://example.com/.*$      [nc] rewritecond %{http_referer} !^http://example.com$      [nc] rewritecond %{http_referer} !^http://www.example.com/.*$      [nc] rewritecond %{http_referer} !^http://www.example.com$      [nc] rewriterule .*\.(jpg|jpeg|gif|png|bmp)$ - [f,nc]   # start cloudflare:example.com rewrite. not edit  rewritecond %{http_host} ^example.com  rewriterule ^(.*)$ http://www.%{http_host}/$1 [r=301,l]  # end cloudflare rewrite.    #   mod_security can interfere uploading of content such attachments. if #   cannot attach files, remove "#" lines below. #<ifmodule mod_security.c> #   secfilterengine off #   secfilterscanpost off #</ifmodule>  errordocument 401 default errordocument 403 default errordocument 404 default errordocument 405 default errordocument 406 default errordocument 500 default errordocument 501 default errordocument 503 default  <ifmodule mod_rewrite.c>  #   if having problems rewrite rules, remove "#" #   line begins "rewritebase" below. have change     path   #   line may needed enable webdav editing php cgi. #rewriterule .* - [e=http_authorization:%{http:authorization}]  rewritecond %{request_filename} -f [or] rewritecond %{request_filename} -l [or] rewritecond %{request_filename} -d rewriterule ^.*$ - [nc,l] rewriterule     ^(data/|js/|styles/|install/|favicon\.ico|crossdomain\.xml|robots\.txt) - [nc,l] rewriterule ^.*$ index.php [nc,l] </ifmodule>