Losing $ in MATCH

Sometimes a regex must include the end-of-line symbol.  But when I
want to include what was matched in a diagnostic header or log entry,
The matched $ puts an unwanted newline in the output.

Does anyone have a simple way to knock the trailing $ off when it's
there, but only when it is there?

Here's a simple example:

    :0
    * THING ?? ()\/(<.* +.*>|<[^>]*$)
    {
        LOG = "found: $MATCH
logged on the line above
"
        :0 fwh
        | formail -A "X-Diagnostic: fake Message-ID: $MATCH"
    }

If the regex matches the second part, the diagnostic header will
dump a gratuitous newline into the body;  The log entry will have
a blank line between the "found: ..." line and "logged..."

man procmailrc says: "When capturing stdout from a recipe into an
environment variable, exactly one trailing newline will be stripped."
So, I tried assigning MATCH to a variable, and printing that.  But
the result was the same,

Any ideas?

TIA,

Jim

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