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#!/usr/bin/perl -sw use vars qw($animal); use Parse::RecDescent; $RD_AUTOACTION = q{ $last = $item[1] }; $grammar = q { sequence: <rulevar: local $last> sequence: base <matchrule: after_$last >(3..) { [ $item[1], @{$item[2]} ] } | base sequence { $item[2] } base: /[ACGT]/ after_A: /[C]/ after_C: /[AG]/ after_G: /[CT]/ after_T: /[G]/ }; $parser = new Parse::RecDescent( $grammar ) or die "bad grammar; bailing"; local $/; use AutoDump; show $parser->sequence(<DATA>); __DATA__ AAACTTTAAAACGTGCGCACGTGTAAAAAA