SED for thousand of 301 redirections on htaccess?

I got a headache with URLS after change them on one of my websites. The URLs were very long and I decided to change them despite the later change via .htacces... I'm making the change one by one (I have more than 1500 URLs...) I have this: Redirect 301 /noticies/festes-noticies/diania-roda-les-aixames-la-nit-de-nadal/ And this becomes: Redirect 301 /noticies/festes-noticies/diania-roda-les-aixames-la-nit-de-nadal/ /diania-roda-les-aixames-la-nit-de-nadal/ The last /-----/, were put at the finish of the line, with one blank space. There are a method with sed or another command to do this easily?