Calculate a feature vector

[davisjam]

This is a great library. Thank you for sharing it.

I am interested in collecting a Chapman&Stolee feature vector from a regex.
(cf. Table 4 in Exploring Regular Expression Usage and Context in Python, ISSTA'16.)

It did not appear to me that this was currently possible. I looked into walking the RegexTree produced by RegexParser, but for example it collapses quantifiers like *, +, and {m,n} into the same type of RegexNode.

I have modified RegexParser.cs to collect a feature vector during ScanRegex. Would a PR be of interest?

[veanes]

Yes it would, thanks for the initiative. I need to look into your other requests as well.