apache - .htaccess rewrite rule for replace space with hyphen in a url -

 mysite.com/details/42/site title or mysite.com/details/42/site%20title

the following rewrite rule generates above url

 rewriteengine on  rewriterule ^details/([0-9]+)/?([a-za-z0-9_-\s]+)/?$ /detail.php?id1=$1&id2=$2

how can change url

 mysite.com/details/42/site-title

how can replace spaces hiphen(-) in url, please help

assuming never have hyphens in "site title", can add this:

rewritecond %{query_string} ^(.*)&id2=([^&]+)(%20|\+)(.+)$ rewriterule ^detail.php$ /detail.php?%1&id2=%2-%4 [l]

IO