Ignore special characters in highlighting?

In the case of including expressions in a string, I don't necessarily want to highlight the expression boundaries as part of the string. For example: Strings are green. If I have a string like this:

"This is ${foo}."

I can highlight `foo` in its own group, denoted by the ${ and }. But the ${} characters are green, along with the rest of the text of the string. Is there a way to avoid this?

Ben

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b

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