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Re: RFC: Parsing with perl - Regexes and beyond

by Anonymous Monk
on Apr 07, 2016 at 01:49 UTC ( #1159779=note: print w/replies, xml ) Need Help??


in reply to RFC: Parsing with perl - Regexes and beyond

For lexing, let regex do all the work

http://ideone.com/sUnahm

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Re^2: RFC: Parsing with perl - Regexes and beyond
by beech (Parson) on May 04, 2016 at 07:51 UTC

    Interesting this ideone if it really lets you run actual perl code, anyway, its best in the future if you also post the code here in code tags, here is the output on my machine

    #!/usr/bin/perl use strict; use warnings; use Data::Dumper; my $input = $ARGV[0] // "2 * 3 + 4 # and a comment\n"; my @tokens; $^R and push @tokens, [$^R, $1] while $^R = undef, $input =~ /( \#.*$ | \s+ | [+-] (?{'AddOp'}) | [*\/] (?{'MulOp'}) | \d+ (?{'Number'}) | \( (?{'OpenParen'}) | \) (?{'CloseParen'}) | . (?{ die "Syntax error at position $-[0]\n" }) )/gmx; print Dumper \@tokens; $ perl sUnahm $VAR1 = [ [ 'Number', '2' ], [ 'MulOp', '*' ], [ 'Number', '3' ], [ 'AddOp', '+' ], [ 'Number', '4' ] ];

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