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#!/usr/bin/perl -w use Parse::RecDescent; #$RD_TRACE=1; #$RD_HINT=1; my $parser = Parse::RecDescent->new(<<'EOG') or die; list1N: <rightop: term ',' term>(s) list12: <rightop: term ',' term>(..2) list2N: <rightop: term ',' term>(2..) list01: <rightop: term ',' term>(?) list: <rightop: term ',' term> list0N: <rightop: term ',' term>(s?) list23: <rightop: term ',' term>(2..3) list03: <rightop: term ',' term>(0..3) term: 't' EOG while (<DATA>) { print; print "\tlist:\t", @{$parser->list($_)||['undef']}, "\n"; print "\tlist01:\t", @{$parser->list01($_)||['undef']}, "\n"; print "\tlist0N:\t", @{$parser->list0N($_)||['undef']}, "\n"; print "\tlist1N:\t", @{$parser->list1N($_)||['undef']}, "\n"; print "\tlist2N:\t", @{$parser->list2N($_)||['undef']}, "\n"; print "\tlist23:\t", @{$parser->list23($_)||['undef']}, "\n"; print "\tlist12:\t", @{$parser->list12($_)||['undef']}, "\n"; print "\tlist03:\t", @{$parser->list03($_)||['undef']}, "\n"; print "-----\n"; } __DATA__ t t,t t,t,t t,t,t,t