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Posted to user@nutch.apache.org by Marek Bachmann <m....@uni-kassel.de> on 2011/06/03 16:23:31 UTC

regex-normalize.xml substitution syntax

Hello all,

can someone explain to me, what the $x in the substitution tags in the 
regex-normalize.xml are good for?

e.g.

<regex>
<pattern>([;_]?((?i)l|j|bv_)?((?i)sid|phpsessid|sessionid|cHash)=.*?)(\?|&amp;|#|$)</pattern>
<substitution>$4</substitution>
</regex>

I guess it is some kind of variable but I can't figure out which value 
it could hold.

Thank you very much.

Re: regex-normalize.xml substitution syntax

Posted by Sebastian Nagel | exorbyte <se...@exorbyte.com>.

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$4 is the 4th captured group

1 ([;_]?
2   ((?i)l|j|bv_)?
3      ((?i)sid|phpsessid|sessionid|cHash)=.*?)
4        (\?|&amp;|#|$)

so a session ID must be followed by ? & # or end-of-string
but ? & # are inserted again.

Beside: (?i)  means case-insensitive matching until the end of the group

On 06/03/2011 04:23 PM, Marek Bachmann wrote:
> Hello all,
>
> can someone explain to me, what the $x in the substitution tags in the regex-normalize.xml are good for?
>
> e.g.
>
> <regex>
> <pattern>([;_]?((?i)l|j|bv_)?((?i)sid|phpsessid|sessionid|cHash)=.*?)(\?|&amp;|#|$)</pattern>
> <substitution>$4</substitution>
> </regex>
>
> I guess it is some kind of variable but I can't figure out which value it could hold.
>
> Thank you very much.
>