从字符串中提取两种类型的文本

public static List<String> read(String str) {
    List<String> res = new ArrayList<>();

    try (Scanner scan = new Scanner(str)) {
        scan.useDelimiter("\\s*<:\\s*|\\s*:>\\s*");

        while (scan.hasNext())
            res.add(scan.next());
    }

    return res;
}

在我看来你想提取一个配对列表:

public static void main(String[] args) {
    String opening = "<:";
    String closing = ":>";
    String str = " type1a  <:  type2a :> type1b <:  type2b :> type1c   <: type2c :>  ";

    String[] splitted = str.split(closing);
    List<Pair<String, String>> list = new ArrayList<>();

    for (String item : splitted) {
        if (item.trim().isEmpty())
            break;

        int index = item.indexOf(opening);
        String first = item.substring(0, index).trim();
        String second = item.substring(index + opening.length()).trim();
        Pair<String, String> p = new Pair<>(first, second);
        list.add(p);
    }

    for (Pair<String, String> p : list) {
        System.out.println(p.getKey() + " " + p.getValue());
    }
}

将打印

type1a type2a
type1b type2b
type1c type2c