Regular Expression introduction (Microsoft) -- 9. Non-printable characters

Non-printable characters
There are many useful non-printable characters that must be used occasionally. The following table lists escape sequences used to indicate non-printable characters:
Character meaning
Cx matches the control characters specified by x. For example, cM matches a Control-M or carriage return character.
The value of x must be either a A-Z or a-z. Otherwise, c is treated as an original 'C' character.
.
F matches a form feed. It is equivalent to x0c and cL.
Match A linefeed. It is equivalent to x0a and cJ.
Match a carriage return. It is equivalent to x0d and cM.
S matches any blank characters, including spaces, tabs, and page breaks. Equivalent
[Fv].
S matches any non-blank characters. It is equivalent to [^ fv].
Match a tab. It is equivalent to x09 and cI.
V matches a vertical tab. It is equivalent to x0b and cK.