use warnings;
use strict;
use Data::Dumper;

my ( $re, $lin, @g );
my (@inarr) = (
    'stuff{tag}<igo;123>stuff<ig;abc>',
    '<igt;ddd>stuff blah {foo}',
    'stuff blah foo <igxo;dsldkd.eps>',
    '<igt;aaa>stuff blah <igx;hhh>'
);
$re = '<(?:ig|igt|igo|igxo);.+?>';
foreach $lin (@inarr) {
    @g = ( $lin =~ m/$re/g );
    print Dumper( \@g );
}    # foreach


__END__
$VAR1 = [
          '<igo;123>',
          '<ig;abc>'
        ];
$VAR1 = [
          '<igt;ddd>'
        ];
$VAR1 = [
          '<igxo;dsldkd.eps>'
        ];
$VAR1 = [
          '<igt;aaa>'
        ];