CSS is very powerful here because you can take advantage of the other attribute selectors to find partial matches:

div[data-my-data^="my-prefix"] (selects by prefix)

div[data-my-data$="my-suffix"] (selects by suffix)

div[data-my-data*="my-substring"] (selects by substring)

Quite a few more of these:

https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_s...