C# regex match always return false

Question

Here are my test case for c# regex match:

AAA
BB
AAA+15d
BB-205w

The pattern i have used is: @"^(AAA|BB)([\\+|\\-]\\d+[d|w])*$" , when i test it online in some .net regex tester, it says match. but when i run it in c# codes, always return false for the last two test cases. What is wrong with the pattern?

Answer 1

i can't reproduce the mentioned behaviour

List<string> Input = new List<string>() { "AAA", "BB", "AAA+15d", "BB-205w" };
string Pattern = @"^(AAA|BB)([+-]\d+[dw])*$";
foreach (string item in Input)
{
    Console.WriteLine(Regex.IsMatch(item, Pattern));
}

Result:

True 
True 
True 
True