help with conceal

I have a little syntax file, with lines like:

highlight sExamplesInText ctermfg=yellow guifg=yellow
syntax match sExamplesInText /«\zs[^»]\_.\{-}\ze»/

I'd like to use « and » to delimit the text I want to be yellow, but
also, to hide those delimiters.

I tried:

syntax match Conceal /«\|»/ conceal

but that seems not to be the right thing (I did set conceallevel=2).

So, text inside « and » characters should be yellow (or any other
color). But the delimiter should be hidden. What is the way to go?

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