> For the complete MongoDB documentation index, see www.mongodb.com/docs/llms.txt # Standard Analyzer The `standard` analyzer is the default for all MongoDB Search indexes and queries. It divides text into terms based on word boundaries, which makes it language-neutral for most use cases. It converts all terms to lower case and removes punctuation. It provides grammar-based tokenization that recognizes email addresses, acronyms, Chinese-Japanese-Korean characters, alphanumerics, and more. If you select Refine Your Index, the Atlas UI displays a section titled View text analysis of your selected index configuration within the Index Configurations section. If you expand this section, the Atlas UI displays the index and search tokens that the `standard` analyzer generates for each sample string. You can see the tokens that the `standard` analyzer creates for a built-in sample document and query string when you create or edit an index in the Atlas UI Visual Editor. **Important:** MongoDB Search won't index string fields where analyzer tokens exceed 32766 bytes in size. If using the keyword analyzer, string fields which exceed 32766 bytes will not be indexed. ## Example The following example index definition specifies an index on the `title` field in the [sample\_mflix.movies](https://www.mongodb.com/docs/manual/sample-data/sample-mflix.md#std-label-sample-mflix) collection using the `standard` analyzer. To follow along with this example, [load the sample data](https://www.mongodb.com/docs/atlas/import/load-sample-data.md#std-label-sample-data) on your cluster and either use [`mongosh`](https://www.mongodb.com/docs/mongodb-shell.md#mongodb-binary-bin.mongosh) or navigate to the Create a Search Index page in the Atlas UI following the steps in the [Create a MongoDB Search Index](https://www.mongodb.com/docs/search/tutorial.md#std-label-create-fts-index) tutorial. Then, using the `movies` collection as your data source, follow the example procedure to create an index from [`mongosh`](https://www.mongodb.com/docs/mongodb-shell.md#mongodb-binary-bin.mongosh) or the Atlas UI Visual Editor or JSON editor. *** ➤ Use the **Select your language** drop-down menu to set the interface for the example on this page. *** ### Visual Editor 1. Click Refine Your Index to configure your index. 2. In the Index Configurations section, toggle Dynamic Mapping to off. 3. In the Field Mappings section, click Add Field Mapping to open the Add Field Mapping window. 4. Click Customized Configuration. 5. Select `title` from the Field Name dropdown. 6. Click the Data Type dropdown and select String if it isn't already selected. 7. Expand String Properties and make the following changes: | Index Analyzer | Select `lucene.standard` from the dropdown if it isn't already selected. | | --- | --- | | Search Analyzer | Select `lucene.standard` from the dropdown if it isn't already selected. | | Index Options | Use the default `offsets`. | | Store | Use the default `true`. | | Ignore Above | Keep the default setting. | | Norms | Use the default `include`. | 8. Click Add. 9. Click Save Changes. 10. Click Create Search Index. ```javascript db.movies.createSearchIndex( "default", { "mappings": { "fields": { "title": { "type": "string", "analyzer": "lucene.standard" } } } } ) ``` The following query searches the `title` field for the term `action` and limits the output to two results. 1. Click the Query button for your index. 2. Click Edit Query to edit the query. 3. Click on the query bar and select the database and collection. 4. Replace the default query with the following and click Find: ```json [ { "$search": { "text": { "query": "action", "path": "title" } } } ] ``` **Output:** ```js SCORE: 4.001246452331543 _id: "573a1398f29313caabceac7f" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Jericho "Action" Jackson is a Detroit police sergeant who was demoted …" genres: Array (3) imdb: Object languages: Array (1) lastupdated: "2015-08-20 00:24:08.470000000" num_mflix_comments: 2 plot: "Vengence drives a tough Detroit cop to stay on the trail of a power hu…" poster: "https://m.media-amazon.com/images/M/MV5BZWFhNmI3OWQtOTU5Zi00ODA3LWExNj…" rated: "R" released: 1988-02-12T00:00:00.000+00:00 runtime: 96 title: "Action Jackson" tomatoes: Object type: "movie" writers: Array (1) year: 1988 SCORE: 4.001246452331543 _id: "573a1399f29313caabcec6b7" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Jeb Ward is an attorney who specializes in whistle blower, David vs. Goliath cases. When a major auto manufacturer is accused of knowingly marketing a defective car, Ward takes on the case, risking everything." genres: Array (2) imdb: Object languages: Array (1) lastupdated: "2015-09-06 00:42:51.167000000" metacritic: 58 num_mflix_comments: 2 plot: "Jeb Ward is an attorney who specializes in whistle blower, David vs. Goliath cases." poster: "https://m.media-amazon.com/images/M/MV5BNWY5Mjk4ZmItMTAzYS00NWE3LWEzYz…" rated: "R" released: 1991-03-15T00:00:00.000+00:00 runtime: 110 title: "Class Action" tomatoes: Object type: "movie" writers: Array (3) year: 1991 SCORE: 4.001246452331543 _id: "573a13b0f29313caabd333e7" awards: Object cast: Array (4) countries: Array (2) directors: Array (1) fullplot: "Vishi is a local goon who basically likes beating up people to get his way. He falls in love with Khushi, but his life takes a turn when he crosses paths with a ruthless mafia kingpin." genres: Array (3) imdb: Object languages: Array (1) lastupdated: "2015-09-10 17:20:55.697000000" num_mflix_comments: 1 plot: "In order to escape crime and clutches of a ruthless mafia, a Bangkok based goon seeks help from his lookalike, a Mumbai based criminal." released: 2014-12-05T00:00:00.000+00:00 runtime: 144 title: "Action Jackson" tomatoes: Object type: "movie" writers: Array (3) year: 2014 SCORE: 4.001246452331543 _id: "573a13d2f29313caabd913dc" awards: Object countries: Array (1) directors: Array (1) genres: Array (2) imdb: Object languages: Array (1) lastupdated: "2015-06-15 03:15:33.967000000" num_mflix_comments: 0 released: 2011-01-28T00:00:00.000+00:00 runtime: 45 title: "Slow Action" tomatoes: Object type: "movie" writers: Array (1) year: 2011 SCORE: 3.440462112426758 _id: "573a1399f29313caabcedcb0" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Young Danny Madigan is a big fan of Jack Slater, a larger-than-life action hero. When Danny is given a magic ticket, he is transported into Slater's latest adventure." genres: Array (3) imdb: Object languages: Array (1) lastupdated: "2015-08-31 00:11:25.920000000" metacritic: 44 num_mflix_comments: 0 plot: "With the help of a magic ticket, a young film fan is transported into the fictional world of his favorite action movie character." poster: "https://m.media-amazon.com/images/M/MV5BNjdhOGY1OTktYWJkZC00OGY5LWJhY2…" rated: "PG-13" released: 1993-06-18T00:00:00.000+00:00 runtime: 130 title: "Last Action Hero" tomatoes: Object type: "movie" writers: Array (4) year: 1993 SCORE: 3.440462112426758 _id: "573a139af29313caabcf0e84" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Jan Schlichtmann, a tenacious lawyer, is addressed by a group of families whose children have died from leukemia. He takes on a case against two large companies accused of dumping toxic waste." genres: Array (1) imdb: Object languages: Array (1) lastupdated: "2015-09-07 00:21:34.950000000" metacritic: 68 num_mflix_comments: 0 plot: "The families of children who died sue two companies for dumping toxic waste." poster: "https://m.media-amazon.com/images/M/MV5BZmEzNjhiZWEtNTM5OS00ZmQyLThhYj…" rated: "PG-13" released: 1999-01-08T00:00:00.000+00:00 runtime: 115 title: "A Civil Action" tomatoes: Object type: "movie" writers: Array (2) year: 1998 SCORE: 2.687220573425293 _id: "573a1398f29313caabcead32" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Colonel James Braddock has a Vietnamese wife who was supposed to leave Vietnam with him, but was left behind. Years later, he returns to rescue her and their son." genres: Array (2) imdb: Object languages: Array (1) lastupdated: "2015-08-17 00:28:26.627000000" num_mflix_comments: 0 plot: "Colonel James Braddock has a Vietnamese wife who was supposed to leave Vietnam with him, but was left behind." poster: "https://m.media-amazon.com/images/M/MV5BZTRjODU0MTUtMjBmMi00ZTBmLTk2MD…" rated: "R" released: 1988-03-02T00:00:00.000+00:00 runtime: 101 title: "Braddock: Missing in Action III" tomatoes: Object type: "movie" writers: Array (5) year: 1988 SCORE: 2.687220573425293 _id: "573a13a9f29313caabd1f502" awards: Object cast: Array (4) countries: Array (2) directors: Array (1) fullplot: "Bugs Bunny and Daffy Duck are up to their feuding ways again. Tired of all the attention going to Bugs, Daffy persuades the studio to let him go off on his own." genres: Array (3) imdb: Object languages: Array (1) lastupdated: "2015-08-28 00:30:31.080000000" metacritic: 64 num_mflix_comments: 1 plot: "The Looney Tunes search for a man's missing father and the mythical Blue Monkey diamond." poster: "https://m.media-amazon.com/images/M/MV5BMTkxNDk5MDQ2MF5BMl5BanBnXkFtZT…" rated: "PG" released: 2003-11-14T00:00:00.000+00:00 runtime: 91 title: "Looney Tunes: Back in Action" tomatoes: Object type: "movie" writers: Array (1) year: 2003 SCORE: 2.4220800399780273 _id: "573a13bdf29313caabd5acfe" awards: Object cast: Array (4) countries: Array (1) directors: Array (1) fullplot: "Fueled by the belief that another world is possible, acclaimed filmmaker Velcrow Ripper takes us on a journey through the spiritual activism movement." genres: Array (1) imdb: Object languages: Array (1) lastupdated: "2015-08-12 00:50:56" num_mflix_comments: 1 plot: "Captures the exciting movement of Spiritual Activism that is exploding around the planet." poster: "https://m.media-amazon.com/images/M/MV5BMTI2MjM2Mzk2NV5BMl5BanBnXkFtZT…" released: 2008-10-01T00:00:00.000+00:00 runtime: 90 title: "Fierce Light: When Spirit Meets Action" tomatoes: Object type: "movie" writers: Array (1) year: 2008 ``` ```json db.movies.aggregate([ { "$search": { "text": { "query": "action", "path": "title" } } }, { "$limit": 2 }, { "$project": { "_id": 0, "title": 1 } } ]) ``` **Output:** ```json [ { title: 'Action Jackson' }, { title: 'Class Action' } ] ``` MongoDB Search returned these documents because it matched the query term `action` to the token `action` for the documents, which MongoDB Search created by doing the following for the text in the `title` field using the `lucene.standard` analyzer: - Convert the text to lowercase. - Split the text based on word boundaries and create separate tokens. The following table shows the tokens (searchable terms) that MongoDB Search creates using the [Standard Analyzer](https://www.mongodb.com/docs/search/indexes/analyzers/standard.md#std-label-ref-standard-analyzer) and, by contrast, the tokens that MongoDB Search creates for the [Keyword Analyzer](https://www.mongodb.com/docs/search/indexes/analyzers/keyword.md#std-label-ref-keyword-analyzer) and [Whitespace Analyzer](https://www.mongodb.com/docs/search/indexes/analyzers/whitespace.md#std-label-ref-whitespace-analyzer) for the documents in the results: | Title | Standard Analyzer Tokens | Keyword Analyzer Tokens | Whitespace Analyzer Tokens | | --- | --- | --- | --- | | `Action Jackson` | `action`, `jackson` | `Action Jackson` | `Action`, `Jackson` | | `Class Action` | `class`, `action` | `Class Action` | `Class`, `Action` | If you index the field using the: - [Keyword Analyzer](https://www.mongodb.com/docs/search/indexes/analyzers/keyword.md#std-label-ref-keyword-analyzer), MongoDB Search wouldn't match the documents in the results for the query term `action` because the `keyword` analyzer matches only documents in which the search term matches the entire contents of the field (`Action Jackson` and `Class Action`) exactly. - [Whitespace Analyzer](https://www.mongodb.com/docs/search/indexes/analyzers/whitespace.md#std-label-ref-whitespace-analyzer), MongoDB Search wouldn't match the documents in the results for the query term `action` because the `whitespace` analyzer tokenizes the `title` field value in its original case (`Action`) and the query term has the lowercase `action`, which doesn't match the `whitespace` analyzer token.