替换C＃中的模式值

Question

i am having string "Test uid=1 Test2 uid=2 Test3 uid=3"

i wrote regex to get all uid.

That gives me list of uid {1,2,3}

for this values i have some diff values {1 = 2015, 2=2016, 3=3014}

I tried to use Regex.replace(str, regexPattern, "")

As it replace all the regex matching item by single value.

Now i want to replace this old values by new value.

Code

string str = "Test uid=1 Test2 uid=2 Test3 uid=3"
var uiList = regex.Matches(str);

I am thinking about MatchCollection.

Answer 1

You can use the version of Regex.Replace accepting MatchEvaluator - Regex.Replace Method (String, String, MatchEvaluator)

Sample method (without checking of input data):

string input = "Test uid=1 Test2 uid=2 Test3 uid=3";
var replacements = new Dictionary<string,string> {
    { "1", "2015" },
    { "2", "2016" },
    { "3", "3014" }
};
string output = Regex.Replace(input, @"(?<=uid=)\d+", m => replacements[m.Value]);