如何在其他带括号的字符串中匹配带嵌套括号的字符串?

你可以试试 @"FIXED.*?(?=\]\[)" 图案:

 FIXED  - fixed part
 .*?    - zero or more arbitrary characters (as few as posible)
 ][     - followed by ][ (but not included into the match) 

演示:

  string[] tests = new string[] {
    "[2020][159]Debugging: [FIXED_RANDOM_324 - Some Text[R] Here[TM]][PRODUCTION1] - [192.0.0.1] - [Mozilla]",
    "[2021][532]Debugging: [FIXED_ABCDEF_21 - Simple][PRODUCTION2] - [192.0.0.32] - [Chrome]",
  };

  Regex regex = new Regex(@"FIXED.*?(?=\]\[)");

  var result = tests
    .Select(test => regex.Match(test))
    .Where(match => match.Success)
    .Select(match => match.Value);

  Console.Write(string.Join(Environment.NewLine, result));

结果:

FIXED_RANDOM_324 - Some Text[R] Here[TM]
FIXED_ABCDEF_21 - Simple

编辑: 如果我们想 打开和关闭括号我们必须使用更详细的模式,例如。

 @"FIXED(?:.*?(?<o>\[)?.*?(?<-o>\])?.*?)*(?=\])"

(?<o>\[) 和 (?<-o>\]) 是 匹配 开放 以及相应的 关闭 括号:

  string[] tests = new string[] {
    "[2020][159]Debugging: [FIXED_RANDOM_324 - Some Text[R] Here[TM]][PRODUCTION1] - [192.0.0.1] - [Mozilla]",
    "[2021][532]Debugging: [FIXED_ABCDEF_21 - Simple][PRODUCTION2] - [192.0.0.32] - [Chrome]",
    "[2021][532]Debugging: [FIXED_XYZ_02 - [Some][Text]][PRODUCTION2] - [192.0.0.32] - [Chrome]",
    "[2021][532]Debugging: [FIXED_XYZ_02 - [Some][Text] more][PRODUCTION2] - [192.0.0.32] - [Chrome]",
  };

  Regex regex = new Regex(@"FIXED(?:.*?(?<o>\[)?.*?(?<-o>\])?.*?)*(?=\])");

  var result = tests
    .Select(test => regex.Match(test))
    .Where(match => match.Success)
    .Select(match => match.Value);

  Console.Write(string.Join(Environment.NewLine, result));

结果:

FIXED_RANDOM_324 - Some Text[R] Here[TM]
FIXED_ABCDEF_21 - Simple
FIXED_XYZ_02 - [Some][Text]
FIXED_XYZ_02 - [Some][Text] more