regex - ElasticSearch错误的正则表达式

Question

我阅读了ElasticSearch的正则表达式查询文档:https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-regexp-query.html

它没有提到如果格式不正确的正则表达式传递到查询中会发生什么情况。

所以我的问题是，如果正则表达式格式不正确怎么办？是引发异常还是某种错误消息？

谢谢!

Answer 1

Elasticsearch引发异常。我添加了一个额外的[，并使用Kibana中的Dev Tools Console运行了正则表达式查询。

GET indexname/_search
{
    "query": {
        "regexp":{
            "field_name": "t.[st"
        }
    }
} 

我得到 search_phase_exception如下:

{
  "error": {
    "root_cause": [
      {
        "type": "query_shard_exception",
        "reason": "failed to create query: {\n  \"regexp\" : {\n    \"field_name\" : {\n      \"value\" : \"t.[st\",\n      \"flags_value\" : 65535,\n      \"max_determinized_states\" : 10000,\n      \"boost\" : 1.0\n    }\n  }\n}",
        "index_uuid": "6fy0LZRxQrOrNEFMGqL0wA",
        "index": "indexname"
      }
    ],
    "type": "search_phase_execution_exception",
    "reason": "all shards failed",
    "phase": "query",
    "grouped": true,
    "failed_shards": [
      {
        "shard": 0,
        "index": "systems",
        "node": "LvCoGAkyTbiVIeyF7UtXTw",
        "reason": {
          "type": "query_shard_exception",
          "reason": "failed to create query: {\n  \"regexp\" : {\n    \"field_name\" : {\n      \"value\" : \"t.[st\",\n      \"flags_value\" : 65535,\n      \"max_determinized_states\" : 10000,\n      \"boost\" : 1.0\n    }\n  }\n}",
          "index_uuid": "6fy0LZRxQrOrNEFMGqL0wA",
          "index": "indexname",
          "caused_by": {
            "type": "illegal_argument_exception",
            "reason": "expected ']' at position 5"
          }
        }
      }
    ]
  },
  "status": 400
}

希望有帮助!