Yea changed it, not sure from what to what, this was what TypeScript 0.9 gave me. But the [RegExp that is used](https://github.com/Bartvds/eslint/blob/2c86f163582bf28724c0ac37b230ab9c2ae4862f/lib/cli.js#L178) supports both actually. 

Should could add a specific test case for that version as well?