The grouping of the keys on the part of the name

I use couchbase 1.8x to store temporary information. Here is my problem: I have many pairs of key-value, but they are, however, conventionally divided into groups (key1_ *; key2_ *; key3_ *). For example the pair would looks like:

"key1_1":"value1"; "key1_2":"value2"; "key1_3":"value3";
"key2_1":"value4"; "key2_2":"value5"; "key2_3":"value6";
"key3_1":"value7"; "key3_2":"value8"; "key3_3":"value9";

I need to send an request that will be used to return information about the availability of values ​​for any of these groups: for example:

var info = client.Get ("key1_ *") or something like that. Is there any filter in the names of keys, or are any options for grouping, which could solve my problem?