C# Regex Replace with parts of the same string

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.

Are you using Visual Studio search/replace? If so, which version of VS, because they changed the regex syntax as of VS2012 — freefaller
– freefaller, Commented Aug 13, 2014 at 14:20
No, I'm generating source files using CodeDom, and then reading the files and performing replace on them using the Regex API. This is all done from code. — Shaggydog
– Shaggydog, Commented Aug 13, 2014 at 14:23

Andrew Whitaker · Accepted Answer · 2014-08-13 14:23:26Z

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

answered Aug 13, 2014 at 14:23

Andrew Whitaker

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