.NET正则表达式中带有单词边界的正则表达式失败

Question

I have a problem with .NET regular expressions in C#. We are trying to match special tokens in a text surrounded by the paragraph sign § . For completeness those the corresponding regular expressions are surrounded by word boundaries \\b . The problem is that the regular expression surrounded by \\b does not match words:

    static void Main(string[] args)
    {
        string data = "I would like to replace this §pattern§ with something interesting";
        string requiredResult = "I would like to replace this serious text with something interesting";

        Regex regSuccess = new Regex("§pattern§");
        Regex regFail = new Regex(@"\b§pattern§\b");

        var dataSuccess = regSuccess.Replace(data, "serious text");
        var dataFail = regFail.Replace(data, "serious text");

        Console.WriteLine("regSuccess match: {0}", dataSuccess == requiredResult);
        Console.WriteLine("regFail match: {0}", dataFail == requiredResult);
        Console.WriteLine("Press enter to continue");
        var line = Console.ReadLine();
    }

As you can see, dataFail == requiredResult returns false .

Answer 1

Replace

Regex regFail = new Regex(@"\b§pattern§\b");

with

Regex regFail = new Regex(@"§\bpattern\b§");

§ is a non-word character, thus, \\b prevents pattern from being matched. Perhaps, you do not even need the \\b here since the pattern is already inside the non-word characters?

Regex regFail = new Regex(@"§pattern§");