c# - 从文件中获取文本 C#

Question

我正在逐行读取文本文件，我想在检查行是否包含特殊字符后获取特殊字符之间的数据。在我的例子中，我想检查行是否包含 <#Tag()>如果它包含然后获取 () 之间的字符串，即行有 <#Tag(param1)>那么它应该返回 param1

但问题是行可能包含不止一个 <#Tag()>例如行有 - <#Tag(value1)> <#Tag(value2)> <#Tag(value3)>然后它应该首先返回 value1然后value2然后 value3

string contents = File.ReadAllText(@"D:\Report Format.txt");
int start = contents.IndexOf("Header") + "Header".Length;
int end = contents.IndexOf("Data") - "Header".Length;
int length = end - start;
string headerData = contents.Substring(start, length);
headerData = headerData.Trim(' ', '-');
MessageBox.Show(headerData);
using (StringReader reader = new StringReader(headerData))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        if (line.Contains("<#Tag"))
        {
            string input = line;
            string output = input.Split('<', '>')[1];
            MessageBox.Show(output);
            Globals.Tags.SystemTagDateTime.Read();
            string newoutput =  Globals.Tags.SystemTagDateTime.Value.ToString();
            input = input.Replace(output, newoutput);
            input = Regex.Replace(input, "<", "");
            input = Regex.Replace(input, ">", "");
            MessageBox.Show(input);
        }
    }
}

Answer 1

尝试以下

var matches = Regex.Matches(line, @"(?<=\<\#Tag\()\w+(?=\)\>)")
foreach (Match match in matches)
  MessageBox.Show(match.Value);

如果您想完成评论中描述的上下文，请尝试以下操作。

  var line = "<#Tag(value1)> <#Tag(value2)>  <#Tag(value3)>";
  var matches = Regex.Matches(line, @"(?<=\<\#Tag\()\w+(?=\)\>)");
  //use matches in your case to find values. i assume 10, 20 , 30
  var values = new Dictionary<string, int>() { { "value1", 10 }, { "value2", 20 }, { "value3", 30 } };
  const string fullMatchRegexTemplate = @"\<\#Tag\({0}\)\>";
  foreach (var value in values)
    Regex.Replace(line, string.Format(fullMatchRegexTemplate, value.Key), value.Value.ToString());