Yep, as usual (for CLI programs) running the command with no arguments (or with invalid arguments) gives you the help.

The tool is quite trivial, it does basic format sanity-checking for patterns but does not tell you what is wrong with the pattern if it rejects it (because the the check so far is just a simple RegEx).

But it's a good way to take into use any led patterns you or someone else has created.

Note: this does not restart mce-daemon (because there might be multiple operations one wants to do and MCE does not like being restarted too often), you need to do it yourself.