c# - Regular expression find and replace to wrap tags

Question

Does anyone know how to use regex to find and replace certain word with

<b>[Keyword]</b>

I tried to use Regex.Replace() but it seems it only support direct replacement instead of appending <b></b> at begin and last of the keyword.

Example:

Hello World!

Keyword:

Hello

Output:

<b>Hello</b> World!

Answer 1

You may try this:

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        string
            input = "Hello World!",
            keyword = "Hello";

        var result = Regex
            .Replace(input, keyword, m => 
                String.Format("<b>{0}</b>", m.Value));
        Console.WriteLine(result);
    }
}