How to allow dashes in select match key?

[mdrayer]

For the select argument, I am having trouble setting up the match keys where one has a dash. Example:

{locale, select, es {Español} en-US {English} other {Unknown}}

Here, the "keys" are es, en-US, and other. I get the following error:

'EXPECT_SELECT_ARGUMENT_SELECTOR_FRAGMENT ({locale, select, es {Español} en-US {English} other {Unknown}})'

I'm not seeing any specifics on what is a valid key in the docs (https://next-intl-docs.vercel.app/docs/usage/messages#selecting-enum-based-values). Am I to assume that dashes aren't allowed, or is there some syntax magic I need to be using here? I have tried various syntax ('en-US', "en-US", en'-US, [en-US], (en-US)), but none seem to work.

[amannn]

Thanks for the great question! I've clarified this in the docs in #967, hope this helps!

[mdrayer]

Thanks, it does! Only alphanumeric and underscores allowed 👍

[cueedee]

Maybe I'm connecting dots where I shouldn't, but doesn't the ICU spec say that dashes should be allowed here?

At least that is how I interpret: https://icu.unicode.org/design/formatting/select : (note the final - in the [a-zA-Z0-9_-] regexp character class)

• The pattern string for SelectFormat allows user-defined keywords that match the pattern [a-zA-Z][a-zA-Z0-9_-]* as well as the predefined keyword "other". ...