Escape caractors

\aMatches a bell character, \u0007.
\bIn a character class, matches a backspace, \u0008.
\tMatches a tab, \u0009.
\rMatches a carriage return, \u000D. (\r is not equivalent to the newline character, \n.)
\vMatches a vertical tab, \u000B.
\fMatches a form feed, \u000C.
\nMatches a new line, \u000A.
\eMatches an escape, \u001B.
\nnnUses octal representation to specify a character (nnn consists of up to three digits).
\xnnUses hexadecimal representation to specify a character (nn consists of exactly two digits).
\cXMatches the ASCII control character that is specified by X or x, where X or x is the letter of the control character.
\unnnnMatches a Unicode character by using hexadecimal representation (exactly four digits, as represented by nnnn).
\When followed by a character that is not recognized as an escaped character in this and other tables in this topic, matches that character. For example, \* is the same as \x2A. This allows the regular expression engine to disambiguate language elements (such as * or ?) and character literals (represented by \* or \?).