one-more-minute/Jewel — pull request #65 by Varanas (2014-08-09 11:18:45+00:00)
Title: add support for underscores in number

Something that'd be nice is if I could a regex like `[0-9]+(_[0-9]{3})+`
to work with the current implementation, because that would provide
extra error checking (whether the `_` are in the right place or not).