Elasticsearch 7 Quick Start Guide

The pattern analyzer

A pattern analyzer splits the text into terms using a regular expression. The regular expression must match the token separators and not the tokens themselves. The regular expression defaults to non-word characters using \W+:

POST _analyze {    "analyzer": "pattern",    "text": "This is my first program and these are my first line."}

This will output the following result, in a single term:

[this, is, my, first, program, and, these, are my first line.]

The pattern analyzer can be configured using the following:

• The pattern parameter defaults to \W+.
• The flags parameter represents Java flags.
• The lowercase parameter defaults all words to lowercase (the default is true).
• The stopwords parameter is a pre-defined stop words list ...