129 lines
2.5 KiB
Plaintext
129 lines
2.5 KiB
Plaintext
[[analysis-lowercase-tokenizer]]
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=== Lowercase tokenizer
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++++
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<titleabbrev>Lowercase</titleabbrev>
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++++
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The `lowercase` tokenizer, like the
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<<analysis-letter-tokenizer, `letter` tokenizer>> breaks text into terms
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whenever it encounters a character which is not a letter, but it also
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lowercases all terms. It is functionally equivalent to the
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<<analysis-letter-tokenizer, `letter` tokenizer>> combined with the
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<<analysis-lowercase-tokenfilter, `lowercase` token filter>>, but is more
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efficient as it performs both steps in a single pass.
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[discrete]
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=== Example output
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[source,console]
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---------------------------
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POST _analyze
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{
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"tokenizer": "lowercase",
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"text": "The 2 QUICK Brown-Foxes jumped over the lazy dog's bone."
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}
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---------------------------
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/////////////////////
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[source,console-result]
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----------------------------
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{
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"tokens": [
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{
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"token": "the",
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"start_offset": 0,
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"end_offset": 3,
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"type": "word",
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"position": 0
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},
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{
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"token": "quick",
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"start_offset": 6,
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"end_offset": 11,
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"type": "word",
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"position": 1
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},
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{
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"token": "brown",
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"start_offset": 12,
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"end_offset": 17,
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"type": "word",
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"position": 2
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},
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{
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"token": "foxes",
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"start_offset": 18,
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"end_offset": 23,
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"type": "word",
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"position": 3
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},
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{
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"token": "jumped",
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"start_offset": 24,
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"end_offset": 30,
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"type": "word",
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"position": 4
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},
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{
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"token": "over",
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"start_offset": 31,
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"end_offset": 35,
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"type": "word",
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"position": 5
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},
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{
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"token": "the",
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"start_offset": 36,
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"end_offset": 39,
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"type": "word",
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"position": 6
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},
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{
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"token": "lazy",
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"start_offset": 40,
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"end_offset": 44,
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"type": "word",
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"position": 7
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},
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{
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"token": "dog",
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"start_offset": 45,
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"end_offset": 48,
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"type": "word",
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"position": 8
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},
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{
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"token": "s",
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"start_offset": 49,
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"end_offset": 50,
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"type": "word",
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"position": 9
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},
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{
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"token": "bone",
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"start_offset": 51,
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"end_offset": 55,
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"type": "word",
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"position": 10
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}
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]
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}
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----------------------------
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/////////////////////
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The above sentence would produce the following terms:
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[source,text]
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---------------------------
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[ the, quick, brown, foxes, jumped, over, the, lazy, dog, s, bone ]
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---------------------------
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[discrete]
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=== Configuration
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The `lowercase` tokenizer is not configurable.
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