notes on other WANTED stuff: NSRegularExpression uses ICU regex underneath. However, I think Swift's new native regex support is a from-scratch new engine; it p

notes on other WANTED stuff: NSRegularExpression uses ICU regex underneath. However, I think Swift's new native regex support is a from-scratch new engine; it pretty much has to be to work well with Swift strings and the nifty extended RegEx literal builder mode.