can anyone tell me why the following won't work

i have bags like this:

x:
(utm_source,3)
(sprint_&utm_medium,3)
(banner&utm_campaign,3)
(sprint,3)

i wanna filter out all the bags with 'utm' included and get the last one (sprint, 3),
this is what i used:

y = FILTER x BY REGEX_EXTRACT($0, '(.*)utm(.*)', 0) == null;
this one return nothing;

y = FILTER x BY REGEX_EXTRACT($0, '(.*)utm(.*)', 0) is null;
this one return:
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing. Encountered " "is" "is "" at line 1, column 53.
Was expecting one of:
    "parallel" ...
    "and" ...
    "or" ...
    ";" ...

please help!

Take a look at this
https://issues.apache.org/jira/browse/PIG-2276

May be a workaround could be to check for the size of the return value from
REGEX_EXTRACT instead of using "is null"

Best,
Prashant Kommireddi

On Thu, Dec 1, 2011 at 2:48 PM, Dan Yi <[EMAIL PROTECTED]> wrote:

> can anyone tell me why the following won't work
>
> i have bags like this:
>
> x:
> (utm_source,3)
> (sprint_&utm_medium,3)
> (banner&utm_campaign,3)
> (sprint,3)
>
> i wanna filter out all the bags with 'utm' included and get the last one
> (sprint, 3),
> this is what i used:
>
> y = FILTER x BY REGEX_EXTRACT($0, '(.*)utm(.*)', 0) == null;
> this one return nothing;
>
> y = FILTER x BY REGEX_EXTRACT($0, '(.*)utm(.*)', 0) is null;
> this one return:
> ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing.
> Encountered " "is" "is "" at line 1, column 53.
> Was expecting one of:
>    "parallel" ...
>    "and" ...
>    "or" ...
>    ";" ...
>
> please help!
>
>