Swift 2.1+返回String数组，带有emojis \\ w +表达式

Question

问题是“\ w +”只用纯文本就可以正常工作。但是，目标是避免将表情符号字符包含为空格。

示例：

"This is some text ".regex("\\w+")

期望的输出：

["This","is","some","text",""]

代码：

extension String {
  func regex (pattern: String) -> [String] {
    do {
      let regex = try NSRegularExpression(pattern: pattern, options: NSRegularExpressionOptions(rawValue: 0))
      let nsstr = self as NSString
      let all = NSRange(location: 0, length: nsstr.length)
      var matches : [String] = [String]()
      regex.enumerateMatchesInString(self, options: NSMatchingOptions(rawValue: 0), range: all) {
        (result : NSTextCheckingResult?, _, _) in
        if let r = result {
          let result = nsstr.substringWithRange(r.range) as String
          matches.append(result)
        }
      }
      return matches
    } catch {
      return [String]()
    }
  }
}

上面的代码给出了以下输出：

"This is some text ".regex("\\w+")

// Yields:  ["This", "is", "some", "text"]
//  Note the  are missing.

是编码问题，正则表达式问题还是两者兼而有之？其他答案似乎也表现出同样的问题。

func matchesForRegexInText(regex: String!, text: String!) -> [String] {
  do {
    let regex = try NSRegularExpression(pattern: regex, options: [])
    let nsString = text as NSString
    let results = regex.matchesInString(text,
    options: [], range: NSMakeRange(0, nsString.length))
    return results.map { nsString.substringWithRange($0.range)}
   } catch let error as NSError {
    print("invalid regex: \(error.localizedDescription)")
    return []
   }
  }


let string = "This is some text "
let matches = matchesForRegexInText("\\w+", text: string)

// Also yields ["This", "is", "some", "text"]

我的错误

\ w +是单词边界

 "This is some text \t ".regex("[^ |^\t]+")

// Give correct answer  ["This", "is", "some", "text", ""]