Parse regular expressions

[achudnov]

Right now regular expression bodies are not validated (in both dev and es5) and are stored as a string. While this might be okay for some uses, it would be better if we had a grammar for regexps in the AST and parsed and validated regexps. Shouldn't be hard, just would take some time and diligence. Any takers?

[michaelficarra]

I wouldn't mind doing this. Should be pretty easy. I can base it on https://github.com/michaelficarra/esfuzz/blob/master/src/nodes/RegExp.coffee

[achudnov]

@michaelficarra, thanks for the offer! Feel free to work on this. This is a low-priority issue for me and, given there are a lot of other issues to address, I don't anticipate working on this anytime soon. Please, submit pull requests against the es5 branch. Note, I'm aware that some of the tests for that branch are broken and I'm working to fix that.