从NSString中提取表情符号（unicode）[重复]

Question

我必须解析一些字符串并提取表情符号。

我找不到任何好的解决方案。

假设我有这个字符串：

" xxx ???????? sss ????"

如何获得这 2 个表情符号？

请注意：“???????? == ???? + ????（表情符号修饰符 Fitzpatrick Type-6）”

Answer 1

此代码仅在最新的 iOS 10 SDK 中有效，无法检测到某些组合的表情符号，但如果您觉得可以，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）删除了上面代码中的一些错误。并尝试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("a??b?‍❤️‍?‍?c??")) //->["??", "?‍❤️‍?‍?", "??"]

---

更新2

一个适用于 Swift 2/iOS 9 SDK 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 = "a??b?‍❤️‍?‍?"

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)) //->["??", "?‍❤️‍?‍?"]

如代码中所述，emojiPattern1...emojiPattern4 并不代表 iOS 中可用的完整表情符号集。 （包括 Swift 3 的代码。）您可能需要修改模式。