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What does \ v and \ r mean? Is it white space?

I take a lexical analysis course, and \t\v\r used in lexer definitions to indicate spaces. What is \v and \r exactly ??

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\t is a horizontal tab, \v is a vertical tab, and \r is a carriage return.

They are certainly a subset of the space characters.

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\ 'Single quotation mark (')
\ "Double quotation mark (")
ASCII Bell (BEL)
\ b ASCII Backspace (BS)
\ f ASCII Formfeed (FF)
\ n ASCII Linefeed (LF)
\ N {name} Character name in Unicode database (Unicode only)
ASCII Carriage Return (CR)
ASCII Horizontal Tab (TAB )
\ uxxxx Character with a 16-bit hexadecimal value xxxx (for Unicode only) (1) \ Uxxxxxxxx Character with a 32-bit hexadecimal value for xxxxxxxx (Unicode only) (2)
ASCII Vertical Tab (VT)

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