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I used a similar idea but did as follows:

my $file = '...the OPs File example..." #used as a string # to simplify my # test my @gi_ids = $file =~/gi\|(\d+)\|/g;

That leaves the list @gi_ids containing all of the gi id's that were in the string (i.e., it finds 4 gi id's in the OPs example).

Just another possible strategy. It looks to me like all of the respondents' ideas would work fine. Mine is just another variation.

Hope that helps.

ack Albuquerque, NM

In reply to Re^2: perl script by ack
in thread perl script by sainath

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