There are a number of useful non-printing characters that must be used occasionally.
Escape Sequences that Represent Non-printing Characters
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Character
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Meaning
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\cx
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Matches the control character indicated by x. For example, \cM matches a Control-M or carriage return character. The value of x must be in the range of A-Z or a-z. If not, c is assumed to be a literal 'c' character.
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\f
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Matches a form-feed character. Equivalent to \x0c and \cL.
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\n
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Matches a newline character. Equivalent to \x0a and \cJ.
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\r
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Matches a carriage return character. Equivalent to \x0d and \cM.
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\s
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Matches any white space character including space, tab, form-feed, and so on. Equivalent to [\f\n\r\t\v].
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\S
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Matches any non-white space character. Equivalent to [^ \f\n\r\t\v].
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\t
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Matches a tab character. Equivalent to \x09 and \cI.
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\v
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Matches a vertical tab character. Equivalent to \x0b and \cK.
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