Proper way to FTS Index and search Meta().id or docids using regex or wildcard seaches

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I must have something else going on to block me. There query string is identical to yours now but I am still getting no results. How may one check this in the Couchbase UI?

{
    "query": {
        "conjuncts": [
            {
                "regexp": "(?:abc|xyz)::dp::entity::[0-9]{4,10}", 
                "field": "_id"
            }, 
            {
                "match": "SA", 
                "field": "country.code"
            }
        ]
    }
}

JG