[jira] Commented: (NUTCH-255) Regular Expression for RegexUrlNormalizer to remove jsessionid

["Stefan Neufeind (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/NUTCH-255?page=comments#action_12412777 ] 

Stefan Neufeind commented on NUTCH-255:
---------------------------------------

You might want to have a / right after the .com in the example - but that's not too important here :-)
You can also omit the (.*) at beginning/end of expression as it's not needed for this task

NUTCH-279 includes your patch modified in there.
PS: Thanks for the contribution.

> Regular Expression for RegexUrlNormalizer to remove jsessionid
> --------------------------------------------------------------
>
>          Key: NUTCH-255
>          URL: http://issues.apache.org/jira/browse/NUTCH-255
>      Project: Nutch
>         Type: Improvement

>   Components: fetcher
>     Versions: 0.8-dev
>  Environment: Windows XP Media Center 2005, 2 Gigs RAM, 3.0 Ghz Pentium 4 Hyperthreaded, Eclipse 3.2.0
>     Reporter: Dennis Kubes
>     Priority: Trivial
>  Attachments: urlnormalize_jessionid.patch
>
> Some URLs are filtered out by the crawl url filter for special characters (by default).  One of these is the jsessionid urls such as:
> http://www.somesite.com;jsessionid=A8D7D812B5EFD3099F099A760F779E3B?query=string
> We want to get rid of the jessionid and keep everything else so that it looks like this:
> http://www.somesite.com?query=string
> Below is a regular expression for the regex-normalize.xml file used by the RegexUrlNormalizer that sucessfully removes jsessionid strings while leaving the hostname and querystring.  I have also attached a patch for the regex-normalize.xml.template file that adds the following expression.
> <regex>
>   <pattern>(.*)(;jsessionid=[a-zA-Z0-9]{32})(.*)</pattern>
>   <substitution>$1$3</substitution>
> </regex>

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