syntax region start and end patterns: "inherit" group above?

I have a syntax region where I want the start and end patterns to basically be ignored, highlighting-wise. Thus e.g. if I have an expression marked with ${}, and what is *contained* in the ${} should be highlighted, but the ${} is within a pair of quotes, the ${} characters should be highlighted as the quotes and the text in them is highlighted.

"This is text with ${foo} in the middle of it."

foo should be highlighted one way, and "This is text with ${", and "} in the middle of it" should be highlighted another way.

How can I do this? I tried setting a matchgroup and also tried setting it to NONE, but either way it is not highlighted, whereas I'd like to have it "inherit" the highlighting of the "" text.

Ben

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b

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