Elastic search below query doesn't return any results:
1.) {"query":{"regexp":{"field_name":".*f04((?!z).)*"}}
Why a query like above doesn't return any result?
I'm expecting results like this : ['f00bar', 'f04bar', 'f04barbuh', 'f04ba']
whereas below one returns:
2.) {"query":{"regexp":{"field_name":".*f04((?!z).)*.*"}}
Results returned by this : ['f04bar', 'f04barbuh', 'f04ba', 'f04baz']
I know that 2nd query returns result because of .* at the end, is there anything wrong with '!' in the regexp, it should be something else? how do we use ! as the part of regexp to specify ba should not be followed by z .
Mapping loos like below:
{ "field_name1": { "type": "keyword" }, "field_name2": { "type": "keyword" }, "query": { "properties": { "regexp": { "properties": { "field_name1": { "type": "keyword" }, "field_name2": { "type": "keyword" } } } } } }