Re: Regular Expressions

[Heiko Liedtke <heiko.liedtke@xxxxxxx>]

Sorry,

but I think that bouth of you are wrong...

First Expression

^100(_[ 0-9]+)?$

This matches all paths coming from AS100 and have or have not originated
in another AS. This means, that the paths could have originated in AS100

e.g.
100 999
100 1
100 546
100

Second Expression

^100_[0-9]*$

This matches all paths coming from AS100 and have originated in another 
AS. This means, that
the paths could not have originated in AS100

e.g.
100 999
100 1
100 5456

Regards

Heiko





Peter Cresswell schrieb:

> Fabio,
>
> The difference is the bottom one will match multiple as's in an as path
> becoase the _ is also allowed to be repeated. The 2nd one will only match
> "100 " then a list of digits between 0-9 without any spaces.
>
>
> E.g.
>
> Expression 1 would match: 
> 100 200 300 111
>
> Expression 2 would match:
>
> 100 200300111
>
> Regards,
>
> Peter
>
> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
> Fabio Rodrigues
> Sent: 12 September 2006 16:12
> To: ccielab@xxxxxxxxxxxxxx
> Subject: Regular Expressions
>
> Hi All,
>
> does anyone knows to say the difference of the effect (if exists) of these
> two regular expressions?
>
> ^100(_[ 0-9]+)?$
> ^100_[0-9]*$
>
>
> Tks,
>
>
> Fabio.
>
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