using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string str = "= Fields!Change_Date.Value & Fields!Change_User.Value";
string result = Regex.Replace(str, @"^= Fields!(\w+)\.Value & Fields!(\w+)\.Value$", "$1 && $2");
Console.WriteLine(result);
}
}
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