Regex word boundary expressions

Question

Say for example I have the following string \"one two(three) (three) four five\" and I want to replace \"(three)\" with \"(four)\" but

Answer 1

Here a simple code you may be interested in:

    string pattern = @"\b" + find + @"\b";
    Regex.Replace(stringToSearch, pattern, replace, RegexOptions.IgnoreCase);

Source code: snip2code - C#: Replace an exact word in a sentence