How can I remove a string of text from a files name?

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http://askubuntu.com – Following this question I exported various SVGs to PNGs, but there is a little problem, all files include in their name the extensions .svg and .png as in file.svg.png. Now what I'd like to know is how can I remove the .svg string from the name of the file without going trough each file and do right-click>rename?. (HowTos)