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 November 1, 2024: Merge branch '7.3' into 7.4 (98246aa)