Java - Remove keys matching regex from JsonObject

Question

I'm able to remove the key from JsonObject using:

String prop = "test";
JsonObject o = parser.parse(props).getAsJsonObject();
o.remove(prop);

I need to remove all the keys matching certain pattern from the JsonObject, like anything that starts with "test.*". Instead of iterating over the keys and find a match, is there any other way to remove the keys matching a given pattern?

input: {"test":"0","test_1": "1","test_10":"10", "site":"abc.com"}
expected output: {"site":"abc.com"}

Thanks!

can you share a input / output example please

Youcef LAIDANI
– Youcef LAIDANI

2017-12-07 19:26:25 +00:00
Commented Dec 7, 2017 at 19:26 — Youcef LAIDANI
– Youcef LAIDANI, Commented Dec 7, 2017 at 19:26
iterate over keys and check for contains your test string

ajc
– ajc

2017-12-07 20:07:41 +00:00
Commented Dec 7, 2017 at 20:07 — ajc
– ajc, Commented Dec 7, 2017 at 20:07

Jiri Tousek · Accepted Answer · 2017-12-07 19:29:42Z

1

There isn't.

The best you can do is compile the regex before the loop to improve performance:

Pattern pattern = Pattern.compile(prop);
Iterator<Entry<...>> it = o.entrySet().iterator();
while (it.hasNext()) {
    Entry<...> entry = it.next();
    if (pattern.matcher(entry.getKey()).matches()) {
        i.remove();
    }
}

answered Dec 7, 2017 at 19:29

Jiri Tousek

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