通过使用Regex打开文件来解析字符串行 [英] Parse a string line by opening a file using Regex

问题描述

这是我正在打开的以下文本文件（log.txt），需要使用正则表达式匹配每一行。

This is the below text file(log.txt) I am opening and need to match each line using regular expressions.

Jerty|gas|petrol|2.42 
Tree|planet|cigar|19.00
Karie|entertainment|grocery|9.20

所以我写了这个正则表达式，但它没有匹配。

So I wrote this regular expressions but it is not getting matched.

public static String pattern = "(.*?)|(.*?)|(.*?)|(.*?)";
    public static void main(String[] args) {
        File file = new File("C:\\log.txt");
        try {
            Pattern regex = Pattern.compile(pattern);
            Scanner scanner = new Scanner(file);
            while (scanner.hasNextLine()) {
                String line = scanner.nextLine();
                Matcher m = regex.matcher(line);
                if(m.matches()) {
                    System.out.println(m.group(1));
                }

            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

任何建议都将受到赞赏。

Any suggestions will be appreciated.

推荐答案

| 是一个特殊的正则表达式符号，意思是'或'。所以，你必须逃脱它。

The | is a special regex symbol which means 'or'. So, you have to escape it.

public static String pattern = "(.*?)\\|(.*?)\\|(.*?)\\|(.*?)";

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