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A regex may not follow a specific set of tokens. These were already known before in the `NOT_REGEX` and `NOT_SPACED_REGEX` arrays. (However, I've refactored them to be more correct and to add a few missing tokens). In all other cases (except after a spaced callable) a slash is the start of a regex, and may now start with a space or an equals sign. It’s really that simple! A slash after a spaced callable is the only ambigous case. We cannot know if that's division or function application with a regex as the argument. The spacing determines which is which: Space on both sides: - `a / b/i` -> `a / b / i` - `a /= b/i` -> `a /= b / i` No spaces: - `a/b/i` -> `a / b / i` - `a/=b/i` -> `a /= b / i` Space on the right side: - `a/ b/i` -> `a / b / i` - `a/= b/i` -> `a /= b / i` Space on the left side: - `a /b/i` -> `a(/b/i)` - `a /=b/i` -> `a(/=b/i)` The last case used to compile to `a /= b / i`, but that has been changed to be consistent with the `/` operator. The last case really looks like a regex, so it should be parsed as one. Moreover, you may now also space the `/` and `/=` operators with other whitespace characters than a space (such as tabs and non-breaking spaces) for consistency. Lastly, unclosed regexes are now reported as such, instead of generating some other confusing error message. It should perhaps also be noted that apart from escaping (such as `a /\ b/`) you may now also use parentheses to disambiguate division and regex: `a (/ b/)`. See https://github.com/jashkenas/coffeescript/issues/3182#issuecomment-26688427.