Egexp query not working

Elastic Stack Elasticsearch
1

it`s strange but widcard query is working
{
"query": {
"wildcard": {
"NE_Name": "*L"
}
}
}

{
"took": 7,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 1285,
"max_score": 1,
"hits": [
{
"_index": "pm-
........
....
..

But regexp query not working. I mean responce is empty

{
"query": {
"regexp": {
"NE_Name": "*L"
}
}
}

{
"took": 1,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}

Why ?

2

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