我有2个文本文件：
File1-此文件的格式为 user_id tweet_id tweet_text
文件1
60730027 6298443824 thank you echo park. you've changed A LOT, but as long as I'm getting paid to make you move, I'm still with it! 2009-12-03 02:54:10
60730027 6297282530 fat Albert Einstein goin in right now over here!!! 2009-12-03 01:35:22
File2
该文件的格式为genome_id name ascii_name
4045417 Southwest Indent Southwest Indent
4045418 Southeast Point Southeast Point
以下是读取文件1的代码段：
public void readfromFile() throws FileNotFoundException {
Scanner inputStream;
String source=null;
FileInputStream file = new FileInputStream("file1.txt");
String regex = "/[a-zA-Z ]+/";
Scanner fileScan = new Scanner(file);
while(fileScan.hasNextLine()){
word = fileScan.nextLine();
word = word.replaceAll(regex, "").toLowerCase();
PrintWriter outputStreamName = new PrintWriter(new FileOutputStream("temp.txt"));
outputStreamName.printf("%s",word);
}
我的目的是首先用空值替换user_id，tweet_id，genome_id中存在的数据。然后将大写的值转换为小写。但是，现在只要此代码处理file1，文本文件都不会更改。我也想知道发生了什么事。当我将其输出到控制台时，我得到了输出。
预期产量：
thank you echo park youve changed a lot but as long as im getting paid to make you move im still with it
fat albert einstein goin in right now over here
根据期望的输出，您想要替换字母，点和单词之间的空格以外的所有内容。
[^a-zA-Z. ]+|(?<=\d)\s*(?=\d)|(?<=\D)\s*(?=\d)|(?<=\d)\s*(?=\D)
这是在线演示
或尝试不使用环视
[^a-zA-Z. ]+|\d\s+\d|\D\s+\d|\d\s+\D
在这里\s匹配任何空格字符[\r\n\t\f ]
样例代码：
String regex = "[^a-zA-Z. ]+|(?<=\\d)\\s*(?=\\d)|(?<=\\D)\\s*(?=\\d)|(?<=\\d)\\s*(?=\\D)";
str.replaceAll(regex,"");
输出：
thank you echo park. youve changed A LOT but as long as Im getting paid to make you move Im still with it
fat Albert Einstein goin in right now over here
要'同时从输出中排除，请使用，[^a-zA-Z.' ]+将I'm和you've更改为Im和youve。
最好只使用[a-zA-Z']+所有单词。这是演示
样例代码：
String str = "60730027 6297282530 fat Albert Einstein goin in right now over here!!! 2009-12-03 01:35:22 ";
Pattern p = Pattern.compile("[a-zA-Z']+");
Matcher m = p.matcher(str);
while (m.find()) {
System.out.print(m.group()+" ");
}
输出：
fat Albert Einstein goin in right now over here
注意：因此，您正在检查下一行
改变：
source = inputStream.next();
到：
source = inputStream.nextLine();
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我来说两句