# Exact matches on arrays
**URL:** https://discuss.elastic.co/t/exact-matches-on-arrays/15228
**Category:** Elasticsearch
**Created:** [January 14, 2014, 2:38am UTC](https://discuss.elastic.co/t/exact-matches-on-arrays/15228 "2014-01-14T02:38:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Justin\_Case](https://discuss.elastic.co/u/Justin_Case)
#### Post date: [January 14, 2014, 2:38am UTC](https://discuss.elastic.co/t/exact-matches-on-arrays/15228/1 "2014-01-14T02:38:41Z")
How can I query an array for exact matches? (mapping is not\_analyzed).
e.g. I got a document with the tag [foo] and another one with the tags
[foo, bar]. Only the document with the [foo] tag should return. Right now
I'm using a script filter to limit the array
length: [https://gist.github.com/justincase/b2efde40e19676df29c7](https://gist.github.com/justincase/b2efde40e19676df29c7). There must
be an easier (and less compute expensive) way though?
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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [January 14, 2014, 10:08am UTC](https://discuss.elastic.co/t/exact-matches-on-arrays/15228/2 "2014-01-14T10:08:58Z")
Concatenate the array to a string, index it, and use simple string prefix
matching.
Jörg
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### Author:  [@Justin\_Case](https://discuss.elastic.co/u/Justin_Case)
#### Post date: [January 14, 2014, 4:17pm UTC](https://discuss.elastic.co/t/exact-matches-on-arrays/15228/3 "2014-01-14T16:17:01Z")
Thanks Jörg,
I was hoping for an easier solution but it will do for now.
Cheers.
On Jan 14, 2014, at 11:08 AM, [joergprante@gmail.com](mailto:joergprante@gmail.com) wrote:
> Concatenate the array to a string, index it, and use simple string prefix matching.
>
> Jörg
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:56am UTC](https://discuss.elastic.co/t/exact-matches-on-arrays/15228/4 "2017-07-06T01:56:54Z")