язык программ, не поддерживающих Юникод(A Regional and Language Options setting that specifies the default code pages and associated bitmap font files for a specific computer that affects all of that computer's users. The default code pages and fonts enable a non-Unicode application written for one operating system language version to run correctly on another operating system language version)
escape-последовательность Юникода(In regular expressions, a backslash followed by the letter "u" followed by four hexadecimal digits. It matches a character in the target sequence that has the value that is specified by the four digits)