扫描器的分隔符和java中的正则表达式

时间：2022-09-23 07:47:04

I'm trying to read input word by word, but couldn't figure out how to set Scanner's delimiter to whitespace and punctuation marks except ' (the single quote). Here's what I got

我试着逐字逐句地读输入，但不知道如何将扫描器的分隔符设置为空格和标点符号，除了'(单引号)。这就是我得到的

BufferedReader input;
String line;
Scanner sc;
String word;
try  {
    input = new BufferedReader(new FileReader(path));
    while (input.ready()) {
        line = input.readLine();
        System.out.println("Current Line: " + line);
        sc  = new Scanner(line);
        sc.useDelimiter("\\W\\s^\'");
        //...
    }
}
//...

2 个解决方案

#1

2  

I assume you mean?

我认为你的意思吗?

sc.useDelimiter("\\W\\s^\'");

I would use

我将使用

sc.useDelimiter("[^\\w']+");

String line= "Hello, world!\n 'Computer\n \n Science'\n Hell\n";
System.out.println(Arrays.toString(line.split("[^\\w']+")));

prints

打印

[Hello, world, 'Computer, Science', Hell]

String line= "Hello, world!\n 'Computer\n \n Science'\n Hell\n";
Scanner scan = new Scanner(line);
scan.useDelimiter("[^\\w']+");
while(scan.hasNext())
    System.out.print("|"+scan.next());
System.out.println("|");

prints

打印

|Hello|world|'Computer|Science'|Hell|

#2

1  

You can also use the Tokenizer like that:

你也可以用这样的记号笔:

StringTokenizer st1 = new StringTokenizer("a|b|c");

while(st1.hasMoreTokens())
  System.out.println(st1.nextToken());

Hope that could help you in your case.

希望这能对你的情况有所帮助。

#1

2  

I assume you mean?

我认为你的意思吗?

sc.useDelimiter("\\W\\s^\'");

I would use

我将使用

sc.useDelimiter("[^\\w']+");

String line= "Hello, world!\n 'Computer\n \n Science'\n Hell\n";
System.out.println(Arrays.toString(line.split("[^\\w']+")));

prints

打印

[Hello, world, 'Computer, Science', Hell]

String line= "Hello, world!\n 'Computer\n \n Science'\n Hell\n";
Scanner scan = new Scanner(line);
scan.useDelimiter("[^\\w']+");
while(scan.hasNext())
    System.out.print("|"+scan.next());
System.out.println("|");

prints

打印

|Hello|world|'Computer|Science'|Hell|

#2

1  

You can also use the Tokenizer like that:

你也可以用这样的记号笔:

StringTokenizer st1 = new StringTokenizer("a|b|c");

while(st1.hasMoreTokens())
  System.out.println(st1.nextToken());

Hope that could help you in your case.

希望这能对你的情况有所帮助。

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