Using regular expression while specifying mapping char filter

Question

ElasticSearch supports mapping char filter, where in one can specify a key and its corresponding value. I want to use regular expression in key.

The regular expression I am trying is basically to catch all uppercase symbols ending with I and convert them to strings ending with l. So this looks something like

ABCI => ABCl

String before I is not fixed, hence I am writing regular expression.

I have figured out the left hand part of the expression as [A-Z]+I but I am not able to decide what should be written on the right hand side so that I can catch string ABC as well.

My question is can we use regular expression in mapping char filter. If yes then how can I write the concerned regular expression(especially the right hand side part).

Richa · Accepted Answer · 2017-05-11 16:59:13Z

1

Use Pattern Replace Char Filter:

{
"settings": {
"analysis": {
  "analyzer": {
    "my_analyzer": {
      "tokenizer": "standard",
      "char_filter": [
        "my_char_filter"
      ]
    }
  },
  "char_filter": {
    "my_char_filter": {
     "type": "pattern_replace",
      "pattern": "([A-Z]+)(I)$",   ==> Patterm containg uppaer case characters ending with I
      "replacement": "$11"         =>  Replacing Group 1 with '1'
      }
     }
    }
   }
 }

hope this helps!!

answered May 11, 2017 at 16:59

Richa

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3 Comments

Taranjeet Over a year ago

This solution is fine for one key, but I have a case where in I which keys will be updated when ES is running. What about that ? I was looking for something as flexible as synonyms file

Richa Over a year ago

That was not what the question mentioned. Question Was about Regex expression and the answers addresses that problem. Create another question for that

Taranjeet Over a year ago

Sure. Thanks for the help

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