The extended delimiter notation can be used as a workaround for the second problem: let r = #/\s{2,}|\t/#

The parser has no problems recognizing the Regex compact notation in a playground that I created to reproduce the problem. I declare the Regex on a separate line to make sure. let transaction = "DEBIT     03/05/2022    Doug's Dugout Dogs         $33.27" let r = /\s{2,}|\t/ let fragments = transaction.split(separator: r) The build error is related to line 3. String seems to be missing a variant of split(separator:) that accepts a Regex. Missing in the doc pages as well.

The copy of Xcode at https://developer.apple.com/download/release/ does work without problems.

Yes, that fixed it. Thanks @swillits