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Regex.Unescape Method

Converts any escaped characters in the input string.

Namespace:  System.Text.RegularExpressions
Assembly:  System (in System.dll)

public static string Unescape(
	string str


Type: System.String
The input string containing the text to convert.

Return Value

Type: System.String
A string of characters with any escaped characters converted to their unescaped form.


str includes an unrecognized escape sequence.


str is null.

The Unescape method performs one of the following two transformations:

  • It reverses the transformation performed by the Escape method by removing the escape character ("\") from each character escaped by the method. These include the \, *, +, ?, |, {, [, (,), ^, $,., #, and white space characters. In addition, the Unescape method unescapes the closing bracket (]) and closing brace (}) characters.


Unescape cannot reverse an escaped string perfectly because it cannot deduce precisely which characters were escaped,

  • It replaces the representation of unprintable characters with the characters themselves. For example, it replaces \a with \x07. The character representations it replaces are \a, \b, \e, \n, \r, \f, \t, and \v.

If the Unescape method encounters other escape sequences that it cannot convert, such as \w or \s, it throws an ArgumentException.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.