String text = "U#:zhang_san#:ASSIGN#:2#:0#:0#:0#:#:#:#:#;U#:wang_wu#:ASSIGN#:2#:0#:0#:0#:#:#:#:#;";
        Matcher m = Pattern.compile("U#:([^#]+)#").matcher(text);
        StringBuilder sb = new StringBuilder();
        while(m.find()){
            sb.append(m.group(1)).append(":");
        }
        if(sb.length()>1)
            sb.deleteCharAt(sb.length()-1);
        System.out.println(sb.toString());

------解决方案--------------------
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Java code

        String text = "U#:zhang_san#:ASSIGN#:2#:0#:0#:0#:#:#:#:#;U#:wang_wu#:ASSIGN#:2#:0#:0#:0#:#:#:#:#;";
        Matcher m = Pattern.compile("U#:([^#]+)#").matcher(text);
        Strin……