Capitalization breaks it(?)

[NanoCats]

Reproduction steps

1. Be me, experimenting with plugin, write a color in whatever format like so
   

2. Get color from a site which had it in multi formats, wanted to see if it works on two in the same message

3. Entering #55E0BF (Eucalyptus) - RGB 85, 224, 191 causes just the hex code to be accepted, sure, can't account for all formats I guess

4. Try again, discover that RGB being capitalized stops ANY color formatting in this message
   

I thought this was enough of a thing that resembles a bug that it was worth reporting.

[Puv1s]

Yeah thanks, I'll be modifying the regex so it takes wider range of capitalization and spacings.