Single Character Escape 

Identifies a set containing only one character, usually because that character is difficult or impossible to write directly into a regular expression.

Syntax

SingleCharEsc ::= '\' [nrt\|.?*+(){} #x2Dx5B#X5D#x5E]

Remarks

The following table shows valid single character escapes and their descriptions.

Valid single character escapes	Set of characters C(R)
\n	The new line character (#xA).
\r	The return character (#xD).
\t	The tab character (#x9).
\\	\
\|	|
\.	.
\-	-
\^	^
\?	?
\*	*
\+	+
\{	{
\}	}
\(	(
\)	)
\{	{
\}	}
\[	[
\]	]

See Also

Reference

XML Schema Regular Expressions
XML Schema Regular Expressions Reference Chart

Concepts

Data Type Facets