Simple TBB for replacing Label delimiters

gistfile1.cs

//The alternative uses $$Label$$
const string pattern = @"\$\$([A-Za-z0-9_-]+)\$\$";
//Replacement regex for %%Label%%
const string replacement = "%%$1%%";
            
Item output = package.GetByName(Package.OutputName);
string outputString = Regex.Replace(output.GetAsString(), pattern, replacement);

output.SetAsString(outputString);
package.PushItem(Package.OutputName, output);
base.Transform(engine, package);