Regex query with ~ not working as expected

Elastic Stack Elasticsearch
1

Hi,

I have a keyword field, and the value is email address like:
"21fd4444d3b0$28c042c9$ca123123$@abc.com"

when I do prefix query, I can get the result:

{
   "size": 10, 
   "query": {
     "prefix": {
       "myfield": {
        "value": "<21fd4444d3b0"
       }
     }
   }
 }

But when I do aggregation query, I can't get expected result:

{
  "size": 10, 
  "query": {
    "regexp": {
      "myfield": {
        "value": "\\<[0-9a-f]{4}**~(0[12])**[0-9a-f]{8}$[0-9af]{8}$[0-9a-f]{8}$@",
        "flags": "ALL"
      }
    }
  },
  "aggs": {
    "NAME": {
      "terms": {
        "field": "myfield",
        "size": 1000
      }
    }
  }
}

What I want to match is string that start with "<" and 4 hex chars, not followed by "01" or 02", and end with <8 hex><8 hex><8 hex>$, but I see that the some unexpected value returned, like:

"<000001d38fe4$20990770$61fb1231$@abc.com>"

The sixth and seventh chars are "01", this is not expected, because I use "~(0[12])" in the pattern, it should not matched.

Can anyone help to point out what is wrong with my query?

Thanks!

2

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