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C# - Substitution
Substitutions are used in replacement patterns. The following table lists the substitutions −
| Character | Description | Pattern | Replacement pattern | Input string | Resulting 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" |
csharp_regular_expressions.htm
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