With [regex]::matches()we can condense all that and it could work on a big blob of text instead of just a list of individual lines. In regex plugin of gedit, I use a regex to match/search and another for substitution. Indicates which match to use. (? Finally, \G matches again, and the engine matches " C:31 ". They are created by placing the characters to be grouped inside a set of parentheses. match_object.group(0) says that the whole part of match_object is chosen. refName_gn - not set. 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. It is equivalent to the {0,} quantifier. (a)? Parentheses group together a part of the regular expression, so that the quantifier applies to it as a whole. 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 regular expression may match multiple times. refName_n_gm, where m=0,1,2 - the groups for match n. refName - always set to the default value. 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. Capturing groups are a way to treat multiple characters as a single unit. If the referenced capturing group took part in the match attempt thus far, the “then” part must match for the overall regex to match. 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 the matching regex, I only have one group. Use a value of zero to indicate JMeter should choose a match at random. Of the nine digit groups in the input string, five match the pattern and four (95, 929, 9219, and 9919) do not. 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. For example, the regular expression (dog) creates a single group containing the letters "d", "o", and "g". Match Zero or More Times: * The * quantifier matches the preceding element zero or more times. * is a greedy quantifier whose lazy equivalent is *?. This means that if there is more than 1 match per line we can still get it! Regex.Match returns a Match object. The Groups property on a Match gets the captured groups within the regular expression. The content, matched by a group, can be obtained in the results: The method str.match returns capturing groups only without flag g. Regex Groups. 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