C＃正则表达式用相同字符串的部分替换

Question

I'm trying to replace parts of a generated code file:

    public System.Nullable<int> SomeInt { get; set; }

    public System.Nullable<bool> SomeBool { get; set; }

    public System.Nullable<bool> SomeOtherBool { get; set; }

What I'm trying to get is this:

    public int? SomeInt { get; set; }

    public bool? SomeBool { get; set; }

    public bool? SomeOtherBool { get; set; }

I know the code is equivalent, with the latter being just syntactic sugar. But I want to do it anyway cause it's more readable.

The regex patterns are easy enough to write,

System\.Nullable<.*>

for the whole thing, and something like

(?<=System\.Nullable<).*(?=>)

to get just the primitive type inside. But I can't for the life of me figure out how to use C#'s Regex API to implement the replacement correctly.

Answer 1

Using Regex.Replace with a named capture group would work:

string replaced = Regex.Replace(src, @"System\.Nullable<(?<type>.*)>", "${type}?");

Example: https://dotnetfiddle.net/GWsKlf