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Pig >> mail # user >> Replacing string in input parameter

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Replacing string in input parameter
I am trying to replace string in the input parameter. Is something like
this possible? I am passing comma separated list of dirs and I have several
sub dirs that I need to read from individually in those dirs so that after
loading I can stored them as merged ouput
pig -p

%declare page_input_path REPLACE($input_path,"output","output/page")

%declare network_input_path REPLACE($input_path,"output","output/network")