查找所有正则表达式匹配的字符串

我有一个如下所示的组合命令字符串，每个命令长度都不固定，最小为22，最大为240：

5B01CA0F00000241FF0201040F325D5B01CA0F00000241FF0201040F335D6B01FF0000000010FF01FF0000000F6D5B01CA0F00000241FF0201040F345D5B01CA0F00000241FF0201040F355D6B01FF0000000010FF01FF0000000F6D

我想提取5B .... 5D或6B .... 6D之类的命令，因此预期结果是：

5B01CA0F00000241FF0201040F325D

5B01CA0F00000241FF0201040F335D

6B01FF0000000010FF01FF0000000F6D

5B01CA0F00000241FF0201040F345D

5B01CA0F00000241FF0201040F355D

6B01FF0000000010FF01FF0000000F6D

我使用了正则表达式模式

5B[0-9a-fA-F]{22,240}5D 要么 (?<=5B)([0-9a-fA-F]{22,240})(?=5D)

只有一个匹配，有人可以帮我吗？

string regexPattern = "(?<=5B)([0-9a-fA-F]{22,240})(?=5D)";
string command = txtRegexCmd.Text.Trim();
MatchCollection matchedResults = Regex.Matches(command, regexPattern, RegexOptions.IgnoreCase);
string matchedCmd = string.Empty;
foreach (Match matchResult in matchedResults)
{
    matchedCmd += matchResult.Value + ",\r\n";
}
MessageBox.Show(matchedCmd);