VB.Net - Substitutions

Substitutions are used in replacement patterns. The following table lists the substitutions −

Character	Description	Pattern	Replacement pattern	Input string	Result string
$number	Substitutes the substring matched by group number.	\b(\w+)(\s)(\w+)\b	$3$2$1	"one two"	"two one"
${name}	Substitutes the substring matched by the named groupname.	\b(?< word1>\w+)(\s)(?< word2>\w+)\b	${word2} ${word1}	"one two"	"two one"
$$	Substitutes a literal "$".	\b(\d+)\s?USD	$$$1	"103 USD"	"$103"
$&	Substitutes a copy of the whole match.	(\$(\d(\.+\d+)?){1})	**$&	"$1.30"	"$1.30"
$`	Substitutes all the text of the input string before the match.	B+	$`	"AABBCC"	"AAAACC"
$'	Substitutes all the text of the input string after the match.	B+	$'	"AABBCC"	"AACCCC"
$+	Substitutes the last group that was captured.	B+(C+)	$+	"AABBCCDD"	AACCDD
$_	Substitutes the entire input string.	B+	$_	"AABBCC"	"AAAABBCCCC"

vb.net_regular_expressions.htm