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Elastic Docs ›Elasticsearch Guide [7.10] ›Text analysis ›Tokenizer reference

Lowercase tokenizer

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Lowercase tokenizer

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The lowercase tokenizer, like the letter tokenizer breaks text into terms whenever it encounters a character which is not a letter, but it also lowercases all terms. It is functionally equivalent to the letter tokenizer combined with the lowercase token filter, but is more efficient as it performs both steps in a single pass.

Example output

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POST _analyze
{
  "tokenizer": "lowercase",
  "text": "The 2 QUICK Brown-Foxes jumped over the lazy dog's bone."
}

The above sentence would produce the following terms:

[ the, quick, brown, foxes, jumped, over, the, lazy, dog, s, bone ]

Configuration

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The lowercase tokenizer is not configurable.

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