You don't need a pattern for that, split will do:

use Data::Dumper;
my %found;
while (<DATA>) {
    my ($file, @vers) = split " ";
    if (-f $file) {
        $found{$file} = [ @vers ];
    }
}
print Dumper(\%found);
__DATA__
Files Checked IN: 
      test/abc.txt    1.23   1.3.4.5 
      team/hello.cpp  2.1    NONE
      Clear/thing.pl  NONE   1.2.34 
      etc etc
[download]

Output:

$VAR1 = {
          'Clear/thing.pl' => [
                                'NONE',
                                '1.2.34'
                              ],
          'team/hello.cpp' => [
                                '2.1',
                                'NONE'
                              ],
          'test/abc.txt' => [
                              '1.23',
                              '1.3.4.5'
                            ]
        };
[download]

You write

Need to call this pattern in one line..(requirement of my script)

Do you mind to tell why you do have such a requirement?

<update>

Anyways, you want the /g modifier on your pattern, and thus you can't say

if ( $var =~ m{$pattern}g ) {
[download]

because that will match only once (but without resetting the match location). If you really have to match globally and evaluate the result in a scalar (or boolean) context, you have to write something like

if ( (@matches = $var =~ m{$pattern}g ) > 0) {
[download]

which is ugly and not very readable. Anyways, here it is...

$var="Files Checked IN: 
      test/abc.txt    1.23   1.3.4.5 
      team/hello.cpp  2.1    NONE
      Clear/thing.pl  NONE   1.2.34 
      etc etc";

my $pattern = '([\w./]+)\s+([\d.]+|NONE)\s+([\d.]+|NONE)';

if ( ( @matches = $var =~ m{$pattern}g ) >0 ) {
    print join('|',@matches),$/;
}
[download]

</update>