But if the RegexOptions parameter of a regular expression pattern matching method includes the RegexOptions.ExplicitCapture flag, or if the n option is applied to this subexpression (see Group options later in this topic), the matched subexpression is not captured. The capture that is numbered zero is the text matched by the entire regular expression pattern.īy default, the ( subexpression ) language element captures the matched subexpression. Captures that use parentheses are numbered automatically from left to right based on the order of the opening parentheses in the regular expression, starting from one. Where subexpression is any valid regular expression pattern. The following grouping construct captures a matched subexpression: Zero-width negative lookbehind assertionsįor information on groups and the regular expression object model, see Grouping constructs and regular expression objects. Zero-width positive lookbehind assertions NET regular expression engine and indicates whether they are capturing or non-capturing. The following table lists the grouping constructs supported by the. Retrieve individual subexpressions from the Match.Groups property and process them separately from the matched text as a whole. Include a subexpression in the string that is returned by the Regex.Replace and Match.Result methods. For more information about quantifiers, see Quantifiers.
Match a subexpression that is repeated in the input string.Īpply a quantifier to a subexpression that has multiple regular expression language elements. You can use grouping constructs to do the following:
Grouping constructs delineate the subexpressions of a regular expression and capture the substrings of an input string.
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