从NSString中提取表情符号

Question

我必须解析一些字符串并提取表情符号。

我找不到好的解决办法。

假设我有一条绳子：

“xxx sss”

我怎么能得到这两个表情符号？

注意：“== + (Emoji修饰符Fitzpatrick Type-6)”

Answer 1

此代码仅在最新的iOS 10 SDK中工作，无法检测到一些组合的表情符号，但如果可以，请尝试：

func emojis(_ str: String) -> [String]  {
    //You may need to add some extra characters as "Umbrella on ground" does not have property "Emoji_Presentation".
    let emojiPattern1 = "[\\p{Emoji_Presentation}\\u26F1]" //Code Points with default emoji representation
    let emojiPattern2 = "\\p{Emoji}\\uFE0F" //Characters with emoji variation selector
    let emojiPattern3 = "\\p{Emoji_Modifier_Base}\\p{Emoji_Modifier}" //Characters with emoji modifier
    let emojiPattern4 = "[\\U0001F1E6-\\U0001F1FF][\\U0001F1E6-\\U0001F1FF]" //2-letter flags
    let pattern = "\(emojiPattern4)|\(emojiPattern3)|\(emojiPattern2)|\(emojiPattern1)"
    let regex = try! NSRegularExpression(pattern: pattern, options: [])
    let matches = regex.matches(in: str, options: [], range: NSRange(0..<str.utf16.count))
    return matches.map{(str as NSString).substring(with: $0.range)}
}

print(emojis(" xxx  sss  ")) //->["", ""]

(更新)删除了上述代码中的一些错误。再试着检测一些组合的表情符号。

func emojisIncludingCombined(_ str: String) -> [String]  {
    //You may need to add some extra characters as "Umbrella on ground" does not have property "Emoji_Presentation".
    let emojiPattern1 = "[\\p{Emoji_Presentation}\\u26F1]" //Code Points with default emoji representation
    let emojiPattern2 = "\\p{Emoji}\\uFE0F" //Characters with emoji variation selector
    let emojiPattern3 = "\\p{Emoji_Modifier_Base}\\p{Emoji_Modifier}" //Characters with emoji modifier
    let emojiPattern4 = "[\\U0001F1E6-\\U0001F1FF][\\U0001F1E6-\\U0001F1FF]" //2-letter flags
    let pattern = "\(emojiPattern4)|\(emojiPattern3)|\(emojiPattern2)|\(emojiPattern1)"
    let combinedPattern = "(?:\(pattern))(?:\\u200D(?:\(pattern)))*"
    let regex = try! NSRegularExpression(pattern: combinedPattern, options: [])
    let matches = regex.matches(in: str, options: [], range: NSRange(0..<str.utf16.count))
    return matches.map{(str as NSString).substring(with: $0.range)}
}
print(emojisIncludingCombined("ab‍❤️‍‍c")) //->["", "‍❤️‍‍", ""]

UPDATE2

一个在Swift 2/IOS9SDK中工作的示例。

func emojis(str: String) -> [String]  {
    //You may need to add "refine" (or "tune") emojiPattern1...emojiPattern4.
    let emojiPattern1 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900-\\U0001F9FF]" //Code Points with default emoji representation
    let emojiPattern2 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900–\\U0001F9FF]\\uFE0F" //Characters with emoji variation selector
    let emojiPattern3 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900–\\U0001F9FF][\\U0001F3FB-\\U0001F3FF]" //Characters with emoji modifier
    let emojiPattern4 = "[\\U0001F1E6-\\U0001F1FF][\\U0001F1E6-\\U0001F1FF]" //2-letter flags
    let pattern = "\(emojiPattern4)|\(emojiPattern3)|\(emojiPattern2)|\(emojiPattern1)"
    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 ?"
let str4 = "I am going to the ⛱beach with some monkeys "
let str5 = "Japan boy ♏️Scorpis" //="\u{1F1EF}\u{1F1F5}Japan \u{1F466}\u{1F3FB}boy \u{264f}\u{FE0F}Scorpis"
let str6 = " xxx  sss  "
let str7 = "ab‍❤️‍‍"

print(emojis(str1)) //->["", ""]
print(emojis(str4)) //->["⛱", "", ""]
print(emojis(str5)) //->["", "", "♏️"]
print(emojis(str6)) //->["", ""]
print(emojis(str7)) //->["", "", "❤️", "", ""]

func emojisIncludingCombined(str: String) -> [String]  {
    //You may need to add "refine" (or "tune") emojiPattern1...emojiPattern4.
    let emojiPattern1 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900-\\U0001F9FF]" //Code Points with default emoji representation
    let emojiPattern2 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900–\\U0001F9FF]\\uFE0F" //Characters with emoji variation selector
    let emojiPattern3 = "[\\u2600-\\u27BF\\U0001F300-\\U0001F77F\\U0001F900–\\U0001F9FF][\\U0001F3FB-\\U0001F3FF]" //Characters with emoji modifier
    let emojiPattern4 = "[\\U0001F1E6-\\U0001F1FF][\\U0001F1E6-\\U0001F1FF]" //2-letter flags
    let pattern = "\(emojiPattern4)|\(emojiPattern3)|\(emojiPattern2)|\(emojiPattern1)"
    let combinedPattern = "(?:\(pattern))(?:\\u200D(?:\(pattern)))*"
    let regex = try! NSRegularExpression(pattern: combinedPattern, options: [])
    let matches = regex.matchesInString(str, options: [], range: NSRange(0..<str.utf16.count))
    return matches.map{(str as NSString).substringWithRange($0.range)}
}

print(emojisIncludingCombined(str7)) //->["", "‍❤️‍‍"]

正如代码中注释的那样，emojiPattern1.emojiPattern4并不代表iOS中可用的一组完整的表情符号。(包括Swift 3的代码)您可能需要修改模式。