This works:

#!/usr/bin/perl -w

use strict;

my @data = ('# Version: 1.11',
        '* Version: 1.11',
        'Version: 1.11',
        '/* Version: 1.11');

foreach my $row (@data) {
    if( $row =~ m/^([\#\*] | \/\* )? \s*version:?\s+ (\d+\.\d+|)/ix) {
    print "$row   \t $2 \n";
    }
}
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and outputs:

# Version: 1.11          1.11 
* Version: 1.11          1.11 
Version: 1.11            1.11 
/* Version: 1.11         1.11 

The regexp looks for lines whixh start either with # or * or with /* or none of these.