Replacing multiple string Replace() with a single Regex.Replace()
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if I'm doing something like that:

    someString.Replace("abc","").Replace("def","").Replace("ghi","")

How can I replace that with 

    Regex.Replace(someString," \\here I don't know what the pattern should be")

I've tried this:

    Regex.Replace(someString, @"(?:abc|def|ghi)")

but it didn't work