Question

我是java和regex的新手，我想知道匹配的正则表达式是“A”还是“OO”还是“NC”。我将它与文本文件进行比较。我读了其他线程并尝试了但我做不到。我的主要方法也有问题，说未报告的例外请帮助。

UserLogin.java

public static String userLoginVerify(String actNum,String pass) throws FileNotFoundException
{
    Scanner scan = null;
    AtmMenu atm = new AtmMenu();
    try {   
            scan = new Scanner(new BufferedReader(new FileReader("atm\\atmstatus.flat")));
            while(scan.hasNext())
            {   
                String lines;
                lines = scan.nextLine();
                Pattern pattern = Pattern.compile("[A]||[OO]||[NC]");

                        Matcher matcher = pattern.matcher(lines);

                if(matcher.find()) {
                    System.out.println(matcher.group(1));    
                    }
            }

    }catch(FileNotFoundException filenotfound)
        {
            System.out.println("File \"atmstatus.flat\" can't be found!");
        }       
    finally
    {   
        if(scan != null)
        scan.close();
        return "me";
    }
}

mainmethod这里

public static void main(String[] login) 
{   
    passLoginInfo(login[0],login[1]);   

}

public static void passLoginInfo(String accountNumber, String password)
{
    UserLogin userLogin = new UserLogin();  
    userLogin.userLoginVerify(accountNumber, password);

}

这是我正在检查的文件

currentamount               | stat
P500,000,000,000,000,000.00 | A

我正在检查统计信上的字母

Answer 1

如果它只是关于A，OO和NC，那么你可以使用正则表达式：

?.*\\s*A|OO|NC\\s*.*$

Answer 2

我解决了我的问题，这就是我所做的：

scan = new Scanner(new BufferedReader(new FileReader("atm\\atmstatus.flat")));
            while(scan.hasNext())
            {   
                String lines;
                lines = scan.nextLine();
                System.out.println(lines[2]);
                Pattern pattern = Pattern.compile("[A]|[OO]|[NC]");             
                        Matcher matcher = pattern.matcher(lines);                                               
                if(matcher.find()) {
                    System.out.println(matcher.group(0));    
                    }
            }

获得java正则表达式的匹配

2 个答案: