Match References, Variables and Fixed Strings
The <group> and <data> elements can reference match groups from parent expressions or from stored matches in variables. In the case of the <group> element, referenced values are passed on to child expressions whereas the <data> element can use match group references for name and value attributes. In the case of both elements the way of specifying references is the same.
Last modified October 16, 2025: Update 7.10 rel notes (26abb2c)