| Subject: | Escape Sequences Not Parsing - Recdescent |
| Date: | Fri, 16 Apr 2010 18:32:38 +0530 |
| To: | "bug-Parse-RecDescent [...] rt.cpan.org" <bug-Parse-RecDescent [...] rt.cpan.org> |
| From: | "Anand Venkatesan, ERS, HCLTech" <anand.vn [...] hcl.in> |
Hi Damian,
I'm trying to parse the escape sequences like \n \t using Rec-descent parser, but the REGEX I used in the production unit is not parsing the escape sequences present in my input. Here my piece of code taken from my actual lengthy program,
Recdescent version : Parse-RecDescent-1.964
Perl Version : v5.8.8 built for MSWin32-x86-multi-thread
### Program Starts ####
use strict;
use warnings;
use Parse::RecDescent;
my $Parser = q{
start : parse_it(s)
parse_it : parse_slash_anychar
| <error>
parse_slash_alphabet : /\\./ {print "Parsed Escape Sequences $item[1]\n";} #Here it Should be /\\\./ but don't know why so
};
my $Data = join '', <DATA>;
my $C_Parser_Obj = Parse::RecDescent->new($Parser);
$C_Parser_Obj->start($Data);
__DATA__
\n \t
### Program Ends ###
I found when I use REGEX /\\./ it is not parsing \n or \t. But when I use REGEX /\\\./ it is parsing without any error. But I believe it should work with double front slash instead of triple. I'm facing this problem only inside the Recdescent, but in normal PERL REGEX programs it is working fine with double front slash itself.
Shall I know this is how the Recdescent package developed or this was an unexpected one? Based on which I will change all the similar occurrences in my program.
Thanks,
Anand V
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