Milter-greylist

reschauzier wrote:
> --- In milter-greylist@yahoogroups.com, Matt Kettler <mkettler@...> wrote:
> 
>> True, the back reference will also pick up:
>>
>> 1a4443K23_1
>>
>> Which may or may not be desirable.
> 
> I must be missing something here; how does
> 
> [0-9]+([^0-9])[0-9]+\1[0-9]+\1[0-9]+
> 
> pick up
> 
> 1a4443K23_1

Sorry, you're right. because of the back-reference, the non-digits must all be
the same. That said, they can be _anything_ that isn't a digit, and then numeric
sections can be _any_ length.

Better examples are:
1a4443a23a1
111111111111p2p3p4
2Q345245234Q2342313Q4