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Apple provides scripts that can handle tasks such as yours, perhaps already installed on your hard drive. You can download them at Apple's Free AppleScript Scripts web page (ie, Replace Text In Item Names).
If you want to write your own script, I suggest that you add Leonard Rosenthol's RegEx Commands OSAX to your Scripting Additions folder. RegEx Commands allows you to easily add search and replace functions to scripts including using "Regular Expressions."