Regex.Unescape(String) Method

Definition

Namespace:

System.Text.RegularExpressions

Assemblies:

netstandard.dll, System.Text.RegularExpressions.dll

Source:

Regex.cs

Converts any escaped characters in the input string.

C#

public static string Unescape(string str);

Parameters

str

String

The input string containing the text to convert.

Returns

String

A string of characters with any escaped characters converted to their unescaped form.

Exceptions

ArgumentException

str includes an unrecognized escape sequence.

ArgumentNullException

str is null.

Remarks

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.

Note

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

• It replaces the hexadecimal values in verbatim string literals with the actual printable characters. For example, it replaces @"\x07" with "\a", or @"\x0A" with "\n". It converts to supported escape characters such as \a, \b, \e, \n, \r, \f, \t, \v, and alphanumeric characters.

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

Applies to

See also

• Escape(String)
• Regular Expression Language - Quick Reference