问题
Consider the following string:
string s = "The man is (old).";
If I use:
Regex.Replace(s,@"\b\(old\)\b", @"<b>$&</b>");
The output is :
The man is (old).
But I would change the whole of the (old) word like this:
The man is (old).
How can I do this?
回答1:
\b won't match because ( and ) are not word characters. Is there a reason why you put them there, because you could just leave them out:
string replaced = Regex.Replace(s,@"\(old\)", @"<b>$&</b>");
According to the specs:
\b : The match must occur on a boundary between a \w (alphanumeric) and a \W (nonalphanumeric) character.
-space- and ) are both nonalphanumeric. The same for ( and ., so \b won't match in both cases.
回答2:
You might not even need a regex... try
string result = s.Replace("(old)", "<b>(old)</b>");
or
string result = s.Replace("(", "<b>(").Replace(")", ")</b>");
来源：https://stackoverflow.com/questions/11439039/how-can-i-replace-specific-word-in-c-sharp-with-parenthesis