On Wed, 29 Apr 1998, Rudolf Kompf wrote:
> if $message_body matches \\$\s*\d+\s+[mb]illion or
> I get
>
> Filter error: failed to expand "$\s*\d+\s+[mb]illion" in filter file:
> $ not followed by letter, digit, or {
The argument after "matches" is string-expanded. Consequently you need to
escape both \ characters and $ characters (and { and } characters if you
have them). What you need is
if $message_body matches \\\$\\s*\\d+\\s+[mb]illion or
I know this is tedious and confusing, but when you've got two different
interpretations of a string going on, this is an unfortunate
consequence.
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