https://bugs.exim.org/show_bug.cgi?id=2363

            Bug ID: 2363
           Summary: expansion-local variables
           Product: Exim
           Version: 4.91
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: String expansion
          Assignee: ni...@exim.org
          Reporter: jgh146...@wizmail.org
                CC: exim-dev@exim.org

It can get tedious, in a complex expansion, having to repeat clauses.  Even
if lookup result are cached, other expansions are not - and the verbiage in the
expression obscures the intent.

Being able to set variables for later use within the expansion would help.
Perhaps done like an RE's capture-group, and affecting $1..n?  Conflict with
other uses of those could be a concern.

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