fix: filter out regex names from .toArgs

[carafelix]

this will fix #24 only for regex's. Command names containing UpperCase letters will still thrown when calling SetMyCommand on them.

They should at least be discouraged. I don't know if it's better to enforce right from the bat the use of lowercaseonly commands or just a mention in the docs. Because they will still register and be handled correctly, but could not be pass to SetMyCommand

[codecov[bot]]

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```diff @@ Coverage Diff @@ ## next #25 +/- ## ======================================= Coverage ? 84.02% ======================================= Files ? 8 Lines ? 582 Branches ? 91 ======================================= Hits ? 489 Misses ? 92 Partials ? 1 ```

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