Ruud asked,
| I have read of a way to force escapes of special characters in a
| variable holding a regexp, but can't remember where I read it.
| Maybe it was a '??' syntax variant.
It's a special procmailism:
$\VAR
will be expanded to the value of $VAR with an empty pair of parentheses
prepended and all regexp metacharacters backslashed.
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