using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string input = "(src=\"cid:image001.png@01D081C1.C5908B40\")";
string replacement = "src=\"\\\\resources\\\\images\\\\$1\"";
Regex rgx = new Regex("src=\"cid:(image[0-9]+\\.png)@[A-Za-z0-9]+\\.[A-Za-z0-9]+\"");
Console.WriteLine(rgx.Replace(input, replacement));
}
}
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