I think that this will run your Perl code with STDIN fed and STDOUT/STDERR catched properly: 

use IPC::Run 'run';
my ($stdout, $stderr);
run [ qw/perl -e/, $code ], '<', \$args, '>>', \$stdout, '2>>', \$stde
+rr;

[download]

Example run: 

$ perl
my $code = q[use feature 'say'; say for 1..10; warn 'zzz'; $z = <STDIN
+>; $z=~y/a-z/A-Z/; say $z];
my $args = q[this is STDIN, why not?];
use IPC::Run 'run';
my ($stdout, $stderr);
run [ qw/perl -e/, $code ], '<', \$args, '>>', \$stdout, '2>>', \$stde
+rr;
print "STDOUT: $stdout\n"; 
print "STDERR: $stderr\n";
__END__
STDOUT: 1
2
3
4
5
6
7
8
9
10
THIS IS STDIN, WHY NOT?

STDERR: zzz at -e line 1.

[download]

__DATA__ will be broken unless you use real files instead of -e 'code' above. Feeding the code to STDIN (with "\n__END__\n" between the code and actual STDIN) may also work, but can break in strange ways with syntax errors in code.

Sorry if my advice was wrong.

In reply to Re: running string as perl script and pass into STDIN programatically by aitap
in thread running string as perl script and pass into STDIN programatically by gideondsouza

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