Oops, I think you confused me with someone else. I did not ask this
question.
Shawn
[EMAIL PROTECTED]
g To: [EMAIL PROTECTED]
cc:
08/20/2002 bcc: Shawn Milochik/US/GODIVA/CSC
04:43 PM Subject: Re: Regex to split router
ifDescr up
Shawn wrote:
>
> So, I have an interesting question and a bit of code. I didn't really
> know whether this was the right forum or not, but here goes.
>
> I have two goals I would like help with:
> 1. Optimize/simplify the regex
> 2. Recognize where the regex would produce false positives on some
> ifDescrs which don't actually have a real hardware path
>
> Really, #1 is most befitting this mailing list, but if anyone wants to
> help with #2 that's great.
>
> For those of you who are famimliar, a cisco router's SNMP ifDescr can
> contain what i would describe as the hardware path of whatever interface
> you are querying. For example, "Ethernet1/0", "T3 3/0/2", "POS2/0/1".
> Juniper routers have a similar thing.
>
> Now, I have the following regex to split these up into four pieces.
> /^([^0-9]+)([0-9]+ |)([0-9]+\/[^\s]+)(.*)$/
> $1 : Is a required match of some non-numeric chars. This would
> match "Ethernet", or the "T" in T3 or T1
> $2 : An optional match which would catch the "3 " in ifDescrs
> like "T3 3/0/1"
> $3 : string starting with one or more numerics, then a "/", then
> all non-whitespace
> $4 : the rest
>
> In all cases I've seen, the text before the hardware path will only end
> in a numeric char if there is a space terminating it. Hence, "T3 3/0/2"
> returning $3 == "3/0/2" and "Ethernet0/1" returning $3 == "0/1".
>
> Now, can anyone see how the regex could be simplified?
You can use \d instead of [0-9], \D instead of [^0-9] and \S instead of
[^\s].
/^(\D+)(\d+ |)(\d+\/\S+)(.*)$/
John
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use Perl;
program
fulfillment
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