you can do this with the search query string, but as KQL (the default option) does not support regex at the moment, you have to switch your query bar to Lucene first. To do this, click the "KQL" text on the right and turn off "Kibana Query Language". Then you can search for it like this: zip:/.* .*/
Make sure your field is keyword indexed for this to work (if you are using the default mapping there will be a zip.keyword field which contains the keyword indexed version of the zip field)
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