On Fri, 8 Jun 2018, Grant Taylor wrote:
On 06/08/2018 05:36 PM, RW wrote:
It can be done if you capture inside a lookahead. For example:
Intriguing.
Indeed.
body X_EQUALS_Y /^(?=.*X=(\d+)\b).*Y=\1\b/
Can I ask that you unpack that Regular Expression? Please.
I'm apparently too rusty to unpack it myself.
Apparently: (?=...) is true if it matches anywhere after that point, but
it is a zero width assertion. So it matches if it occurs in the ".*" prior
to the Y bit, and it also matches if it occurs *after* the Y bit. The cool
part is it includes a capture, so it will pull out matching text before
*or* after the Y bit that can be used in the rest of the expression...
Learn something new every day.
I will have to play with that and see if I can simplify some of my
multiple-header-match rules and get from-in-subj to work regardless of the
header order.
Thanks!
--
John Hardin KA7OHZ http://www.impsec.org/~jhardin/
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