验证文件的文本是否与特定格式匹配

Question

我需要验证文件的文本是否包含以下格式的文本：

#0

DIRECTION: FORWARD

SPEED: 10

TIME: 10

或

#1

DIRECTION: REVERSE

SPEED: 10

ROTATIONS: 10

这将通过多个步骤重复进行。

其中，#后面必须跟一个数字，DIRECTION后面必须跟FORWARD或REVERSE，SPEED后面必须跟一个数字，最后一行必须是TIME或ROTATIONS，后面跟一个数字。

在开始读取值之前，我想验证文件中是否包含这种格式的文本，而不是一些奇怪的值。

我可以使用某种类型的通配符吗？我已经开始考虑Regex了，但我以前没有使用过它。

我想做的是在数字是通配符的情况下进行某种类型的比较，这样我就可以知道行是否包含基本格式：

if(fileLines[0].Matches("#%")) // Where % would be the wildcard?  
if(fileLines[1].Matches("DIRECTION:%")) // Does something like this exist?

Answer 1

这种模式似乎很有效。

    string[] lines = 
    {
        "#0",
        "DIRECTION: FORWARD",
        "SPEED: 10",
        "TIME: 10"
    };

      // meaning At start of line there is a # followed by digits till the end of line
    if(checkLine(@"^#\d+$", lines[0]) == false)
        Console.WriteLine("False on line 1");
    else
        Console.WriteLine("True on line 1");

      // meaning At start of line there is the word DIRECTION: followed by space and the words REVERSE or FORWARD
    if(checkLine(@"^DIRECTION: (REVERSE|FORWARD)", lines[1]) == false)
        Console.WriteLine("False on line 2");
    else
        Console.WriteLine("True on line 2");

      // meaning At start of line there is the word SPEED: followed by a space and digits till the end of the line
    if(checkLine(@"^SPEED: \d+$", lines[2]) == false)
        Console.WriteLine("False on line 3");
    else
        Console.WriteLine("True on line 3");

      // meaning At start of line there are the words TIME or ROTATIONS followed by colon, space and digits till the end of the line
    if(checkLine(@"^(TIME|ROTATIONS): \d+$", lines[3]) == false)
        Console.WriteLine("False on line 4");
    else
        Console.WriteLine("True on line 4");
}

// Define other methods and classes here
private bool checkLine(string regExp, string line)
{
    Regex r = new Regex(regExp);
    return r.IsMatch(line);
}

Answer 2

假设您已将文件中的所有行作为通用列表读取。

        List<string> fileLines = new List<string>();
        fileLines.Add("#0");
        fileLines.Add("DIRECTION: FORWARD");
        fileLines.Add("SPEED: 10");
        fileLines.Add("TIME: 10");
        fileLines.Add("#1");
        fileLines.Add("DIRECTION: REVERSE");
        fileLines.Add("SPEED: 10");
        fileLines.Add("ROTATIONS: 10");

使用此函数验证文件是否有效

致谢: Steve的Regex implementation

    public bool CheckConsistancy(List<string> fileLines)
    {
        bool status = false;
        if (fileLines != null && fileLines.Count > 0)
        {
            if(fileLines.Count % 4 == 0)
            {
                List<List<string>> fileLineGroups = fileLines.Select((x, i) => new { Index = i, Value = x }).GroupBy(x => x.Index / 4).Select(x => x.Select(v => v.Value).ToList()).ToList();
                foreach (List<string> fileLineGroup in fileLineGroups)
                {
                    if (checkLine(@"^#\d", fileLineGroup[0])) 
                    {
                        if (checkLine(@"^DIRECTION: (REVERSE|FORWARD)", fileLineGroup[1]))
                        {
                            if (checkLine(@"^SPEED: \d", fileLineGroup[2]))
                            {
                                if (checkLine(@"^(TIME|ROTATIONS): \d", fileLineGroup[3]))
                                {
                                    status = true;
                                }
                                else
                                {
                                    status = false;
                                    break;
                                }
                            }
                            else
                            {
                                status = false;
                                break;
                            }
                        }
                        else
                        {
                            status = false;
                            break;
                        }
                    }
                    else
                    {
                        status = false;
                        break;
                    }
                }
            }
            else
            {
                status = false;
            }
        }
        return status;
    }

    private bool checkLine(string regExp, string line)
    {
        Regex r = new Regex(regExp);
        return r.IsMatch(line);
    } 

调用函数检查一致性

bool status = CheckConsistancy(fileLines);