.htaccess - htaccess search and replace plus sign with dash -

i have form 2 parameters city,keyword passed search.php ,after submitting redirects url website.com/search/lenovo+laptop+dealers/delhi

but need url parsed without plus signs dash in url

example: website.com/search/lenovo-laptop-dealers/delhi

code in htaccess file

rewriteengine on rewritebase /   rewritecond %{the_request} \s/+search\.php\?keyword=([^&]+)&city=([^\s&]+) [nc] rewriterule ^ /search/%1/%2? [r=301,l,ne]  rewriterule ^search/([\w-]+)/([\w-]+)/?$ /search.php?keyword=$1&city=$2 [l,qsa] 

you can have rules this:

rewriteengine on rewritebase /  rewriterule "^(search)/([^+]*)\++([^+]*\+.*)$" /$1/$2-$3 [l,nc] rewriterule "^(search)/([^+]*)\+([^+]*)$" /$1/$2-$3 [l,r=301,ne,nc]  rewritecond %{the_request} \s/+search\.php\?keyword=([^&]+)&city=([^\s&]+) [nc] rewriterule ^ /search/%1/%2? [r=301,l,ne]  rewriterule ^search/([\w-]+)/([\w-]+)/?$ /search.php?keyword=$1&city=$2 [l,qsa]