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The String Operand
------------------
A *string* operand may be specified as a non-whitespace sequence of:
* Any single character other than a backslash (\\\\) or a white-space
character.
* A backslash-prefixed special character. These are:
=============== ==========================================================
Sequence Meaning
--------------- ----------------------------------------------------------
``\b`` The backspace character.
``\f`` The formfeed character.
``\n`` The newline character.
``\o###`` The three-digit octal representation of a character.
``\r`` The carriage return character.
``\R`` The Unicode replacement character.
``\s`` The space character.
``\t`` The horizontal tab character.
``\u####`` The four-digit hexadecimal representation of a character.
``\U########`` The eight-digit hexadecimal representation of a character.
``\v`` The vertical tab character.
``\x##`` The two-digit hexadecimal representation of a character.
``\X##`` (the case of the X and of the digits isn't significant)
``\<name>`` The Unicode name of a character (use _ for space).
``\{variable}`` The value of a variable.
``\\`` A literal backslash.
``\#`` A literal number sign.
=============== ==========================================================
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