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Make another variable, check if it's not set, make it blank if not, print it.
$var=somethingelse;
if(!defined($var)) $var="";

printf("%s\n", $var);

I suppose you could inject blanks into your...

Not sure if your problem is solved, but here's a solution:


$
$ # The data file
$ cat -n input.pl
1 #!/usr/bin/perl -w
2
3 use strict;
4
5 # This line will...

Try it using just these two regular expressions:
$line[$i] =~ s/[\W\s]/ /g;
$line[$i] =~ s/ \w | \w\w |\s/g;

$string =~ s/\b[^ \t]\b//g;

eq is for comparing strings. To check regular expression use =~ without double quotes:

if ($ARGV[0] =~ m/^-(\d+)$/) { print "I think it works\n"; }