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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
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