How can I use/emulate regex-like backreferences in attribute selectors?

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No, it’s not possible. Attribute selectors are almost completely static and provide almost no dynamic matching functionality (beyond that of substring matches, which are still static and not dynamic pattern-based). They do not support anything like what you see in everyday regular expressions.

A stylesheet preprocessor such as Sass or LESS will allow you to generate the static CSS rules needed, but all that does is automate the manual task of listing all possible values individually, which proves my first point.

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