Question

这是文本文件的一部分，我想要它，所以我可以把它作为：

Column 1 = distribution
Column 2 = votes
Column 3 = rank 
Column 4 = title
Column 5 = year 
Column 6 = Subtitle (but only where there is a subtitle)

我正在使用的正则表达式是：

regexp = 
    "([0-9\\.]+)[ \\t]+([0-9]+)[ \\t]+([0-9\\.]+)[ \\t]+(.*?[ \\t]+\\([0-9]{4}\\).*)";

但是你可以告诉它似乎没有任何关于我如何解决它的想法......

1000000103      50   4.5  #1 Single (2006) {THis would be a subtitle example}
2...1.2.12       8   2.7  $1,000,000 Chance of a Lifetime (1986)
11..2.2..2       8   5.0  $100 Taxi Ride (2001)
....13.311       9   7.1  $100,000 Name That Tune (1984)
3..21...22      10   4.6  $2 Bill (2002)
30010....3      18   2.7  $25 Million Dollar Hoax (2004)
2000010002     111   5.6  $40 a Day (2002)
2000000..4      26   1.6  $5 Cover (2009)
.0..2.0122      15   7.8  $9.99 (2003)
..2...1113       8   7.5  $weepstake$ (1979)
0000000125    3238   8.7   Allo  Allo! (1982)
1....22.12       8   6.5   Allo  Allo! (1982) {A Barrel Full of Airmen (#7.7)

代码IM使用：

    try {
        FileInputStream file_stream = new FileInputStream("/Users/angadsoni/Desktop/ratings-1.txt");
        DataInputStream data_stream = new DataInputStream(file_stream);
        BufferedReader bf = new BufferedReader(new InputStreamReader(data_stream));
        ResultSet rs;
        Statement stmt;
        Connection con = null;
        Class.forName("org.gjt.mm.mysql.Driver").newInstance();
        String url = "jdbc:mysql://localhost/mynewdatabase";
        con = DriverManager.getConnection(url,"root","");
        stmt = con.createStatement();
  try{
    stmt.executeUpdate("DROP TABLE myTable");
  }catch(Exception e){
    System.out.print(e);
    System.out.println("No existing table to delete");

    //Create a table in the database named mytable
  stmt.executeUpdate("CREATE TABLE mytable(distribution char(20)," + "votes integer," + "rank float," + "title char(250)," + "year integer," + "sub char(250));");
 String rege= "^([\\d.]+)\\s+(\\d+)\\s+([\\d.]+)\\s+(.+?)\\s+\\((\\d+)\\)(?:\\s+\\{([^{}]+))?";
  Pattern pattern = Pattern.compile(rege);
  String line;
  String data= "";
  while ((line = bf.readLine()) != null) {
    data = line.replaceAll("'", "");

Matcher matcher = pattern.matcher（data）;

    if (matcher.find()) {
        System.out.println("hello");
        String distribution = matcher.group(1);
        String votes = matcher.group(2);
        String rank = matcher.group(3);
        String title = matcher.group(4);
        String year = matcher.group(5);
        String sub = matcher.start(6) != -1 ? matcher.group(6) : "";
        System.out.printf("%s %8s %6s%n%s (%s) %s%n%n",
        matcher.group(1), matcher.group(2), matcher.group(3), matcher.group(4), matcher.group(5),
        matcher.start(6) != -1 ? matcher.group(6) : "");
        String todo = ("INSERT into mytable " +
            "(Distribution, Votes, Rank, Title, Year, Sub) "+
            "values ('"+distribution+"', '"+votes+"', '"+rank+"', '"+title+"', '"+year+", '"+sub+"');");
        int r = stmt.executeUpdate(todo);
    }//end if statement
  }//end while loop
}

Answer 1

可能还有其他问题，但第一个障碍是反斜杠不能进入正则表达式机器。你需要加倍他们。

Answer 2

我的第一个想法是，使用空格和StringTokenizer分割前几个字段可能更容易，然后对剩余的3个字段使用正则表达式。这样你就可以简化所需的正则表达式。

Answer 3

我试图从标题开始为部分提出一个正则表达式，类似于你想出的部分

(.*)\\s+(\\([0-9]{4}\\))\\s+(.*$)

也许您可以提供更多代码来澄清您正在使用正则表达式做什么？另外，this回答是否有问题？

Answer 4

此正则表达式适用于您提供的数据：

^([\d.]+)\s+(\d+)\s+([\d.]+)\s+(.+?)\s+\((\d+)\)(?:\s+\{([^{}]+))?

如果没有副标题，最后一组（组＃6）将为空。

编辑：这是一个完整的例子：

import java.io.*;
import java.util.*;
import java.util.regex.*;

public class Test
{
  public static void main(String[] args) throws Exception
  {
    Pattern p = Pattern.compile(
      "^([\\d.]+)\\s+(\\d+)\\s+([\\d.]+)\\s+(.+?)\\s+\\((\\d+)\\)(?:\\s+\\{([^{}]+))?"
    );
    Matcher m = p.matcher("");
    Scanner sc = new Scanner(new File("test.txt"));
    while (sc.hasNextLine())
    {
      String s = sc.nextLine();
      if (m.reset(s).find())
      {
        System.out.printf("%s %8s %6s%n%s (%s) %s%n%n",
            m.group(1), m.group(2), m.group(3), m.group(4), m.group(5),
            m.start(6) != -1 ? m.group(6) : "");
      }
    }
  }
}

部分输出：

1000000103       50    4.5
#1 Single (2006) THis would be a subtitle example

2...1.2.12        8    2.7
$1,000,000 Chance of a Lifetime (1986)

...等

正则表达式将文本分成6列

4 个答案: