string - 用空格替换选项卡

Question

我的数据库的文本文件(作业):

'Angola Africa '   
 'Burkina Faso  Africa'  
'Burundi    Africa'  
...... ()

我想用空格替换这些选项卡。我试过了:

fn main() {    
    let data_file = File::open("raw_data2.txt").unwrap();
    let reader = BufReader::new(data_file);
    let mut sql_commands = OpenOptions::new()
        .write(true)
        .open("SQL_input.sql")
        .unwrap();

    for (index, line) in reader.lines().enumerate() {
        let Line: String = line.unwrap(); // Ignore errors.
        Line = Line.replace("   "," ");
        let SQL_query: Vec<&str> = Line.split(' ').collect::<Vec<_>>();
        println!("{}. {}", index + 1, Line); 
        if let Err(e) = writeln!(sql_commands, "{}", SQL_query[0]) {
            eprintln!("Couldn't write to file: {}", e);}
        }    
    }  
}

而 replace什么也没做!我还可以做些什么？

Answer 1

在当前代码中，您要用一个空格替换三个空格。没有制表符受到伤害。考虑将" "替换为"\t"。

Line = Line.replace("\t"," ");