find a first column value ...

203252 GB|AI461105 GB|AI900630 GB|AI900894 GB|AI901187
203253 GB|AI736220 GB|AW780891 GB|BE806781 GB|BG157087
203254 GB|AI440899 GB|AW185396 GB|AW185458 GB|AW152990
203255 GB|AI416923 GB|AI437726 GB|AI437966 GB|AI438062
203256 GB|AI441714 GB|AI930592 GB|AI855868 GB|AI856032

I am new with perl and my problam is if I give any accession no like
AW780891
than it should find the first column value like 203253.
IS any Module there to do this type of work ?
Thanks.

.

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