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PERL: NP Recognizer

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I'm trying to make an NP (Noun Phrase) Recognizer for a project at school. the program should be able to do two things: 1. Put brackets around all N's. 2. When the NP consists of more then one N, the whole things should have brackets around it. My answer for question 1 is: my @pairs = split(' ',$inputtext); foreach my $pair (@pairs) { if ($pair =~ /(\w+)\/(\w+)/g) { if($2 eq "N") {print "["}; print "$1\/"; print $2; if($2 eq "N") {print "]"}; print "\n"} }; But I have defined some NP rules, but how do I make the actual parser??? NP Rules: NP --> N NP --> PRON_UBST, NP NP --> PRON-PERS NP --> PRON-REC NP --> EGEN NP --> PRON_POSS, N NP --> PRON_DEMO, N NP --> PRON_UBST,PP PP --> PRÆP, NP NP --> EGEN_GEN, N, PP NP --> ADJ, N

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