@swift-ci create

Comment by Kyle Macomber (JIRA)

This is because “\r\n” is a single grapheme cluster:

1> "\r\n"
$R0: String = "\r\n"
2> "\r\n".count
$R1: Int = 1

“\r” is a different single grapheme cluster:

3> "\r\n".contains("\r")
$R2: Bool = false

To get the behavior you’re looking for, use the `unicodeScalars` view on String which treats both ”\r” and “\n” as elements in the collection:

4> "\r\n".unicodeScalars.contains("\r")
$R3: Bool = true

Comment by Charles (JIRA)

Thank you for clarifying. The documentation for split() does not reference any exceptions for graphene clusters, so perhaps this is more of a documentation issue. That said, not trying to find out if contains, rather trying to split. I found that this accomplishes what I was expecting:

"abc\r\n123\r\nxyz".unicodeScalars.split(whereSeparator: {CharacterSet(charactersIn: "\r\n").contains($0)}).map(String.init)

Bottom line: if this behavior is as design, then close the issue. You may want to forward to whoever maintains the documentation.