import Foundation

let text = " * Item 1\n * Item 2\n * Item 3\n * Item 4\n * Item 5\n * Item 6\n"

let pattern = "(\\n)?(^[ \\t]*)([*-])[ \\t]+((?s:.+?)(\\n{1,2}))(?=\\n*(\\z|\\2([*-])[ \\t]+))"

if let regex = try? NSRegularExpression(pattern:pattern,options:[NSRegularExpressionOptions.AnchorsMatchLines]){
        //Template replacement
        var mutableString = NSMutableString(string:text)

        regex.replaceMatchesInString(mutableString, options: NSMatchingOptions(), range: NSMakeRange(0,text.characters.count), withTemplate: "Matched: $4")
    
        //Print result
        print(mutableString)
}