C＃正则表达式替换动态匹配的问题？

Question

So I have a long string where I have "reserved words" that I need to be replaced by their value from the db.

eg.

string text = "You're salary for the month of ((month)) is ((salary))

Now what I did was to match each and every reserved word and then search through my dataset and then replace those with their value

Regex ex = new Regex(@"(?<=\(\().*?(?=\)\))");
foreach(Match match in ex.Matches(body)){           
                string valuefromset = values.FirstOrDefault(val => val.Variable == match.Value).Value;
                    var pattern = @"(("+match.Value+"))";
                    body = Regex.Replace(body, pattern, valuefromset, RegexOptions.IgnoreCase);
                }
            }

Now what's happening is this

text = "You're salary for the month of ((April)) is (($10000))";

I wasn't sure as to why the pattern will just get the words and not the tags. Should I be using another regex but with the specific value? Having the specific reserved word is significant in the pattern that's why I used that, wasn't really sure what i was doing.

Any help is appreciated. Thanks!!!

Answer 1

Thats because you don't escape the slashes in the replace regex

var pattern = @"(("+match.Value+"))";
                ^^               ^^

you are not matching them, you create two groups. Try this:

var pattern = @"\(\("+match.Value+"\)\)";