03-23-2017
Oh, that's a new one on me.
It looks like an internationalization feature, awk's equivalent of
digraphs and trigraphs, multi-byte sequences which implement "extended" non-ASCII characters while still writing the program in pure ASCII. They're predefined, so [.STRING.] is meaningless, and there's a big list somewhere of what ASCII sequences actually translate to what Russian characters somewhere.
Of course, the list will be in Russian, so us ASCII-worlders probably don't know the right words to find it. It will also probably depend on being in the right extended-ascii set where they have any meaning and using some Russian subset of awk. This feature is often not implemented unless it's really needed.
So to us, not that useful. To someone's special Russian awk in Russia, it might be indispensable.
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