"If" doesn't loop, so when the test returns true, it prints $1. You'll need to replace the if with a looping construct or (my preference) use the regex in list context:

@text =  ( $text =~ /([a-zA-Z0-9]+\s+[z]{15}\s+[a-z0-9]+)/g) 

if(@text){
    print "first: " . shift(@text) . "\n" if (@text);
     print "second: " . shift(@text) . "\n" if (@text);
}
else{
   print "Search failed\n";
}
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