IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Conditionals with the Pipeline Processor Handling Failures in Pipelines »

› › ›

Conditionals with the Regular Expressions

edit

Conditionals with the Regular Expressions

edit

The if conditional is implemented as a Painless script. If the script.painless.regex.enabled cluster setting is enabled, you can use regular expressions in your if condition scripts. For supported syntax, see Painless regular expressions.

PUT _ingest/pipeline/check_url
{
  "processors": [
    {
      "set": {
        "if": "ctx.href?.url =~ /^http[^s]/",
        "field": "href.insecure",
        "value": true
      }
    }
  ]
}

POST test/_doc/1?pipeline=check_url
{
  "href": {
    "url": "http://www.elastic.co/"
  }
}

Results in:

{
  "_index": "test",
  "_type": "_doc",
  "_id": "1",
  "_version": 1,
  "_seq_no": 60,
  "_primary_term": 1,
  "found": true,
  "_source": {
    "href": {
      "insecure": true,
      "url": "http://www.elastic.co/"
    }
  }
}

Regular expressions can be expensive and should be avoided if viable alternatives exist.

For example in this case startsWith can be used to get the same result without using a regular expression:

PUT _ingest/pipeline/check_url
{
  "processors": [
    {
      "set": {
        "if": "ctx.href?.url != null && ctx.href.url.startsWith('http://')",
        "field": "href.insecure",
        "value": true
      }
    }
  ]
}

« Conditionals with the Pipeline Processor Handling Failures in Pipelines »