The content, matched by a group, can be obtained in the results: The method str.match returns capturing groups only without flag g. Can be combined with the … Here are some regular expressions that will help you to perform a validation and to extract all matched IP addresses from a file.. This page is part of the GNU grep (regular expression file search tool) project. If you want to display all lines that contain a sequence of four digits that is itself not part of any longer sequence of digits, one way is: grep -P '(? right after the opening parenthesis to name a group. 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. grep with -e option also works like egrep, but you have to escape the special characters like paranthesis. 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