gonna greet all vivian's and vivien's (and every single one w/ similar names) like this from now on:
hi, /(b|v)i(i)?(b|v)(e|i)(((a|e)n((n)?(e|a|o))?)|ka)?/gim!
(btw yes i'm serious, that's a working regex for these names! (and even short forms, like "vivi"!)
EDIT: someone noted that "vivjaenn" is missing.
so it now does that too! (but it's longer now, too...)
(it's now /(b|v)i(i)?(b|v)(e|i|j)(((a|e)(e)?n((n)?(e|a|o)?)?)|ka)?/gim...)
oh, and someone on fedi made it shorter (I just had to patch in the case of "vivjaenn", so it isn't a complete mess to look at! (that's just [bv]ii?[bv][eij]((a?[ae]n(n?[eao]?)?)|ka)? in the end)
(for easy copy-pasting: /[bvw]ii?[bvw][eij]((a?[aeë]n(n?[eao]?)?)|ka)?/gi)