Parentheses group together a part of the regular expression, so that the quantifier applies to it as a whole. Regex.Match returns a Match object. Finally, \G matches again, and the engine matches " C:31 ". Capturing groups are a way to treat multiple characters as a single unit. For example, the regular expression (dog) creates a single group containing the letters "d", "o", and "g". In the substitution regex, I use \1 to refer to the group, and I also like to add a zero right behind \1, but \10 will change to mean the 10th group in matching regex. The expression is then followed by an @ sign. In addition group(0) can be be explained by comparing it with group(1), group(2), group(3), ..., group(n).Group(0) locates the whole match expression. Parentheses groups are numbered left-to-right, and can optionally be named with (?...). Match Zero or More Times: * The * quantifier matches the preceding element zero or more times. The (possibly empty) subsequence captured by the group during the previous match, or null if the group failed to match part of the input. refName_n_gm, where m=0,1,2 - the groups for match n. refName - always set to the default value. match_object.group(0) says that the whole part of match_object is chosen. They are created by placing the characters to be grouped inside a set of parentheses. For instance, the regex \b(\w+)\b\s+\1\b matches repeated words, such as regex regex, because the parentheses in (\w+) capture a word to Group 1 then the back-reference \1 tells the engine to match the characters that were captured by Group 1. In regex plugin of gedit, I use a regex to match/search and another for substitution. Indicates which match to use. (? At the starting position of the next match attempt, \G matches, and the engine matches "B:33". The content, matched by a group, can be obtained in the results: The method str.match returns capturing groups only without flag g. This means that if there is more than 1 match per line we can still get it! If the capturing group did not take part in the match thus far, the “else” part must match for the overall regex to match. A positive number N means to select the nth match. Of the nine digit groups in the input string, five match the pattern and four (95, 929, 9219, and 9919) do not. * is a greedy quantifier whose lazy equivalent is *?. Return Value. It is equivalent to the {0,} quantifier. Regular Expression to Given a list of strings (words or other characters), only return the strings that do not match. Group 1 ([a-z0-9_\.-]+) - In this section of the expression, we match one or more lowercase letters between a-z, numbers between 0-9, underscores, periods, and hyphens. The Groups property on a Match gets the captured groups within the regular expression. Regex Groups. refName_gn - not set. 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