Lua Patterns: How do I express this pattern?

["Cena, Resty" <rcena@...>]

Title: Lua Patterns: How do I express this pattern?

Hello,
How do I express this pattern:

CrV

that is, a sequence of any C(onsonant) followed by a specific letter, in this case r, followed by any V(owel).

I guess if I can define somewhere that

%k (consonants)
$v (vowels)

then I can easily say:

[%kr%v]

Any help on how I can accomplish this?

Thanks.

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