No but the JEdit text editor has a plugin available called RETester that is really useful for testing regex's. It also includes integrated regex help at the bottom. You can type a test string and your regex and test it to make sure it does what you want it to do.
Just out of curiosity, what would a regular expression editor look like? Have you seen a good one before?
The screenshot of that looks very similar to JEdits plugin that mentioned. I thought maybe you had in mind an editor where you didn't need to know the funky matching syntax of regex so even the average user could benefit from the power of regex.
I've attached a screenshot of JEdit's plugin if you're interested. JEdit is open source too.
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