No it doesn't - in exactly the same way that the existance of Visual Studio doesn't mean that C# is evil...
Well, the alternative for C# would be to write MSIL,
but the alternative to RegEx is code. And I'll take code over RegEx any day.
What I meant was that you can write C# code using Notepad and compiling from a command prompt, or you can use a full-blown IDE with IntelliSense support such as Visual Studio.
In the same way, you can easily write regular expressions 'by hand', but some people find that utilites like Expresso a great help - especially when they're not overly familiar with regular expression syntax.