More info on Java Pattern here. They are created by placing the characters to be grouped inside a set of parentheses. They allow you to apply regex operators to the entire grouped regex. Non-Capturing Atomic groups are non-capturing, though as with other non-capturing groups, you can place the group inside another set of parentheses to capture the group's entire match; and you can place parentheses inside the atomic group to capture a section of the match. 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In Java 6 groups can only be referenced by their order (beware of nested groups … Groups beginning with (? Non-capturing groups with ? 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