Sed Format String Syntax

Sed-style format strings treat all characters as literals except:

character	description
&	The ampersand character is replaced in the output stream by the whole of what matched the regular expression. Use \& to output a literal '&' character.
\	Specifies an escape sequence.

An escape character followed by any character x, outputs that character unless x is one of the escape sequences shown below.

Escape	Meaning
\a	Outputs the bell character: '\a'.
\e	Outputs the ANSI escape character (code point 27).
\f	Outputs a form feed character: '\f'
\n	Outputs a newline character: '\n'.
\r	Outputs a carriage return character: '\r'.
\t	Outputs a tab character: '\t'.
\v	Outputs a vertical tab character: '\v'.
\xDD	Outputs the character whose hexadecimal code point is 0xDD
\x{DDDD}	Outputs the character whose hexadecimal code point is 0xDDDDD
\cX	Outputs the ANSI escape sequence "escape-X".
\D	If D is a decimal digit in the range 1-9, then outputs the text that matched sub-expression D.