Line 23: printf is not the operator to use ( Perl is not C ). Use print with a trailing newline where appropriate(or, with a recent version of Perl, say)

You'll find this ( sorta' ) works:

for (@ID,@ISIN,@SYMBOL, "\n",) 
    { 
    print  "$_:";
    }
...

[download]

That's a really ugly hack and produces many lines containing only a single colon.

Nonetheless, for part one, see printf and compare to print.

For part two, writing a coherent set of suggestions about the other problems (unnecessary use of arrays which you then route thru a foreach; failing to give your series of "ifs" an escape route (better, perhaps, an if, two elsifs and an else); etc.; would take more time than I have just now. [<update> Besides, muba did a fine job on most of it while I was still fiddling. </update>] Sorry, but perhaps you can infer (or read docs) how this works:

#!/usr/bin/perl
use 5.014;

sub getValue {
            my ($value, $name);  # $name is a throwaway; why?
            $_ = shift;
            ( $name, $value ) = split(/:/);
            $value =~ s/\s//g;
            return $value;
}

print "ID  SYMBOL  ISIN\n";

while (<DATA>) {
    my ($ID,$ISIN,$SYMBOL);
    if ($_ =~ m/ID:/) { 
        $ID = getValue($_); 
        $ID = $ID . ":";       # append colon removed by split
        chomp $ID;
        print $ID;
    } elsif ($_ =~ m/Symbol:/) { 
        $SYMBOL = getValue($_); 
        chomp $SYMBOL;
        $SYMBOL .= ":";        # alternate method to append colon
        print $SYMBOL;
    } elsif ($_ =~ m/ISIN:/) { 
        $ISIN = getValue($_);
        chomp $ISIN;
        print $ISIN ."\n";
    } else {
        next;
    }
}

__DATA__
                  Deleted; see careless OP's request in node below and
+, as msgd to me:
"Sorry for bothering you sir. But could you please change the data on 
+node : http://www. perlmonks.org/? displaytype= displaycode; node_id=
+976512 to : http://www. perlmonks.org/? displaytype= displaycode; nod
+e_id=991009 , appreciate it! !prod data"

[download]

output:

ID  SYMBOL  ISIN
QYQ:LUP2L100OHM:SE0004017929
R1M:TLS2K50OHM:SE0004018539
QNF:MINILONGOMXAO:SE0003990183
QX8:ALF2K160OHM:SE0004017440
NC0:BOL2K170OHM:SE0003842137
NEV:NOK2K90OHM:SE0003843069

[download]

OP or OP's management seems to believe one can make things disappear from the internet.

Wrong. Can you spell "cache" or "waybackmachine?"

OP also seems to think I have some hold over kenosis, as evidenced by this message (verbatim), also received by me:

"kamchez says Re Re: matching strings into array from txtfile and printing on same line
 kenosis, could you please change all of the "data" to dummy data as follows, the reason is that the current data is important production data that shouldn't be online (my fault) and that my employer wants it removed asap "

In reply to Re: matching strings into array from txtfile and printing on same line by ww
in thread matching strings into array from txtfile and printing on same line by kamchez

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