Inconsistent pluralization of Matrix/Vertex

[BrightSoul]

Hello everyone, I think there's an inconsistency with pluralization and I'm asking your opinion about this.

"MatrixValue".Pluralize() returns a value of "MatricesValue". I expected it to be "MatrixValues" but... ok.
"VertexValue".Pluralize() returns a value of "VertexValues" instead, which is not consistent with the above.

So, which one of the two is correct?
I think the issue is in the regexp here

Humanizer/src/Humanizer/Inflections/Vocabularies.cs

Line 41 in 40f49fa

_default.AddPlural("(matr|vert|ind|d)ix|ex$", "$1ices");

Shouldn't it be...

(matr|vert|ind|d)(ix|ex)$

...or, in case you wanted a non-capturing group...

(matr|vert|ind|d)(?:ix|ex)$

That would consistently yield MatrixValues and VertexValues.
Thanks.