using System;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var s = @"<job xmlns:i=""..."" xmlns=""..."">
<password>asdfasdf</password>
<adminPassword>asd</adminPassword>
<AccountKey>asd</AccountKey>
<AccountKeyZ>asd</AccountKeyZ>
...</job>";
		var keyList = new[] { "AccountKey", "PrivateKey", "APIKey", "DefectiveKeyGracefulExpiration" };
		var multiplePatternMatching = string.Format("({0})", string.Join("|", keyList));
		var rx = string.Format(@"(?si)<([^\s<]*password[^\s<]*|{0})>.*?</\1>", multiplePatternMatching);
		Console.WriteLine(Regex.Replace(s, rx, "<$1></$1>"));
		
	}
}