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SkorS

It's shorthand for Regular Expression. (1) A set of characters, meta characters, and operators that define a string or group of strings in a search pattern.(2) A string containing wildcard characters and operations that define a set of one or more possible strings. See also literal string.(3) A mechanism for selecting specific strings from a set of character strings.(4) A sequence of characters or symbols constructed according to the rules defined in POSIX.2 2.8.

15:35, 12 November 2013