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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());