Introduction to Regular Expressions (Microsoft)--9. nonprinting characters

Non-printable characters
There are a number of very useful nonprinting characters that must be used occasionally. The following table shows the escape sequences used to represent these nonprinting characters:
Character meaning
CX matches the control characters indicated by X. For example, CM matches a control-m or carriage return character.
The value of x must be one-a-Z or a-Z. Otherwise, see C as a literal ' C ' word
Character.
F matches a page feed character. Equivalent to x0c and CL.
Matches a line feed character. Equivalent to x0a and CJ.
Matches a carriage return character. Equivalent to x0d and CM.
s matches any whitespace character, including spaces, tabs, page breaks, and so on. Equivalent to
[F v].
S matches any non-white-space character. equivalent to [^ f v].
Matches a tab character. Equivalent to x09 and CI.
V matches a vertical tab. Equivalent to x0b and CK.