獲取字符串中的單詞列表

Question

我是新來的swift。我需要得到的單詞列表形式是一個字符串，其前綴爲#。這裏是我的字符串

「三十人是在6月14日發生火災後確認死亡，但總預期上升得多。......一個人誰貼的圖片上#Facebook有人認爲身體已躍居從#Grenfell塔#fire他去世已經#jailed三個月」

我需要流動詞的列表：

["#Facebook","#Grenfell","#fire","#jailed"] 

我花的時間很多，但無法弄清楚如何實現這一點。

Answer 1

你可以做到這一點是：

let str = "Thirty people are confirmed dead after the June 14 fire, but the total is expected to rise far higher. ... A man who posted pictures on #Facebook of the body of someone believed to have leapt to his death from the #Grenfell Tower #fire has been #jailed for three months" 

let words = str.components(separatedBy: " ").filter { (element) -> Bool in 
     return element.hasPrefix("#") 
    } 
print(words) 

Answer 2

下面是簡單的解決方案：

邏輯：拆分文本字的數組，然後用謂詞過濾。

let stringText = "Thirty people are confirmed dead after the June 14 fire, but the total is expected to rise far higher. ... A man who posted pictures on #Facebook of the body of someone believed to have leapt to his death from the #Grenfell Tower #fire has been #jailed for three months" 

    let wordsArray = stringText.characters.split{$0 == " "}.map(String.init) 

    let filteredList = wordsArray.filter {NSPredicate(format:"SELF BEGINSWITH %@","#").evaluate(with: $0)} 

Answer 3

使用NSRegularExpression用於與某些前綴原樣

//Xcode 8.3 swift 3.x 
    var string: String = "Thirty people are confirmed dead after the June 14 fire, but the total is expected to rise far higher. ... A man who posted pictures on #Facebook of the body of someone believed to have leapt to his death from the #Grenfell Tower #fire has been #jailed for three months" 

let regex = try? NSRegularExpression(pattern: "#(\\w+)", options: []) 
let matches: [NSTextCheckingResult] = (regex?.matches(in: string, options: [], range: NSRange(location: 0, length: (string.characters.count))))! 
for match in matches { 
    let wordRange = (match).rangeAt(1) 
    let word = (string as NSString).substring(with: wordRange) 
    print("Found tag - \(word)") 
} 




    // Objective c -> 

NSString*string = @"Thirty people are confirmed dead after the June 14 fire, but the total is expected to rise far higher. ... A man who posted pictures on #Facebook of the body of someone believed to have leapt to his death from the #Grenfell Tower #fire has been #jailed for three months"; 
    NSError *error = nil; 

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"#(\\w+)" options:0 error:&error]; 
    NSArray *matches = [regex matchesInString:string options:0 range:NSMakeRange(0, string.length)]; 
    for (NSTextCheckingResult *match in matches) { 
     NSRange wordRange = [match rangeAtIndex:1]; 
     NSString* word = [string substringWithRange:wordRange]; 
     NSLog(@"Found tag %@", word); 
    }