$line = '|i1234|lABCD|i5678|i90|lBOO';

while($line =~ /\|i([^|]*)|\|l([^|]*)/g) {
   print("barcode: $1\n") if (defined($1));
   print("homeloc: $2\n") if (defined($2));
}

__END__
output
======
barcode: 1234
homeloc: ABCD
barcode: 5678
barcode: 90
homeloc: BOO

##</code><code>##

$line = '|i1234|lABCD|i5678|i90|lBOO';

for ($line) {
   /\G \|i     ([^|]*) /gcx && do { print "barcode: $1\n";  redo; };
   /\G \|l     ([^|]*) /gcx && do { print "homeloc: $1\n";  redo; };
   /\G \|[^il]  [^|]*  /gcx && do { redo; }; # skip bad stuff
}

__END__
output
======
barcode: 1234
homeloc: ABCD
barcode: 5678
barcode: 90
homeloc: BOO