A quick search of MetaCPAN turns up a few modules that are happy to deal with FASTA files. The first one I see is Bio::SeqReader::Fasta, which may help you out.
Have a read through these choices, and see if some of the examples help you out.
In reply to Re: Trypsin digestion
by talexb
in thread Trypsin digestion
by BioUs2003
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