Apache Htaccess 301 Redirect Commands

Looking for someone to write an .htaccess command that will redirect dynamic URL strings to another URL string. I already have some other commands in the existing htaccess file, but I cannot get the variables correct for the items below. Here are some examples of what I am looking for. old url: [login to view URL] new url: [login to view URL] -- old url: [login to view URL] new url: [login to view URL] -- old url: [login to view URL] new url: [login to view URL] -- Notice that the + (plus) symbol is replaced with a - (dash) in the new URL string. Also, there are some strings that were indexed in the search engines that I need to have 301 directed via the .htaccess file. [login to view URL] [login to view URL] [login to view URL] I would like the above to be redirected to the following respectively: [login to view URL] [login to view URL] [login to view URL] In other words....remove anything after the "keywords" parameter and redirect to the [login to view URL] page. Also note the keywords in the old URL strings may also be indexed without the + (plus) sign, and only contain spaces. So "keywords=cheap red shoes" should always be redirected to the [login to view URL] page.