In a replacement pattern, $ indicates the beginning of a substitution.ДЇor functionality similar to a replacement pattern within a regular expression, use a backreference. In a regular expression pattern, $ is an anchor that matches the end of the string. The only character that can appear either in a regular expression pattern or in a substitution is the $ character, although it has a different meaning in each context. Similarly, substitution language elements are recognized only in replacement patterns and are never valid in regular expression patterns. ), which matches any character, are supported. None of the other regular expression language elements, including character escapes and the period (. Substitutions are the only special constructs recognized in a replacement pattern. Substitution Elements and Replacement Patterns For more information, see Substituting the Entire Input String. Includes the entire input string in the replacement string. For more information, see Substituting the Last Captured Group. Includes the last group captured in the replacement string.

For more information, see Substituting the Text after the Match. Includes all the text of the input string after the match in the replacement string. For more information, see Substituting the Text before the Match. Includes all the text of the input string before the match in the replacement string. For more information, see Substituting the Entire Match. Includes a copy of the entire match in the replacement string. For more information, see Substituting a '$' Symbol. Includes a single '$' literal in the replacement string. For more information, see Substituting a Named Group. Includes the last substring matched by the named group that is designated by (? ) in the replacement string. For more information, see Substituting a Numbered Group.

Includes the last substring matched by the capturing group that is identified by number, where number is a decimal value, in the replacement string. NET defines the substitution elements listed in the following table. The methods replace the matched pattern with the pattern that is defined by the replacement parameter. Replacement patterns are provided to overloads of the Regex.Replace method that have a replacement parameter and to the Match.Result method. The replacement pattern can consist of one or more substitutions along with literal characters. They use a regular expression pattern to define all or part of the text that is to replace matched text in the input string. Substitutions are language elements that are recognized only within replacement patterns.

Regular expression not group