在 Swift 中，如何检测“表情符号标签”？ [复制]

Question

func getEmojiTags(text: String) -> [String] {
}

表情符号标签是两部分的组合，它们之间没有空格。如果它们之间有空格，则它不是 emojiTag。

• 一个表情符号
• 不是表情符号的字符串

例如：

Hello, my name is Jason ???? ???? how are you ?-> []
Hello, my name is ????Jason -> [????Jason]
Hello, my name is ???? Jason -> [] 
I am going to the ⛱beach with some ????monkeys ????  -> [⛱beach, ????monkeys]

Answer 1

尝试将NSRegularExpression 与表情符号代码范围一起使用。

func emojiTags(str: String) -> [String]  {
    //A little bit simplified, you may need to define what are your "emoji".
    //This is a subset defined in http://stackoverflow.com/a/36258684/6541007 .
    let emojiCharacters = "\\U0001F600-\\U0001F64F\\U0001F300-\\U0001F5FF\\U0001F680-\\U0001F6FF\\u2600-\\u26FF"
    let pattern = "[\(emojiCharacters)][^\(emojiCharacters)\\s]+"
    let regex = try! NSRegularExpression(pattern: pattern, options: [])
    let matches = regex.matchesInString(str, options: [], range: NSRange(0..<str.utf16.count))
    return matches.map{(str as NSString).substringWithRange($0.range)}
}
let str1 = "Hello, my name is Jason ? ? how are you ?"
print(emojiTags(str1)) //->[]
let str2 = "Hello, my name is ?Jason"
print(emojiTags(str2)) //->["?Jason"]
let str3 = "Hello, my name is ? Jason"
print(emojiTags(str3)) //->[]
let str4 = "I am going to the ⛱beach with some ?monkeys ?"
print(emojiTags(str4)) //->["⛱beach", "?monkeys"]