An alternate way to build a string (your file name) is to use the concatenation ('.') operator (refer: Additive Operators) rather than interpolation. In this case it has the advantage that you keep your single quotes and single backslashes. I have used Test::Simple to verify that I have constructed the string you expect.
use strict;
use warnings;
use Test::Simple tests=>1;
# Expected
#
my $expected_file_name = 'D:\PROJ\N123_X3\dataInfo_X-4_Y5_decode.csv';
# Given
my $X_info = 3;
my $Y_info = -4;
my $Z_info = 5;
my $concatenated_name =
'D:\PROJ\N123_X'
. $X_info # 3
. '\dataInfo_X'
. $Y_info # -4
. '_Y'
. $Z_info # 5
. '_decode.csv'
;
ok($concatenated_name eq $expected_file_name, 'concatenation');
OUTPUT:
1..1
ok 1 - concatenation
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