## QSTR

Performs a query string query and returns `true` if the provided query string matches the row.

## Syntax

`QSTR(query)`

### Parameters

#### `query`

Query string in Lucene query string format.

## Examples

```esql
FROM books
| WHERE QSTR("author: Faulkner")
| KEEP book_no, author
| SORT book_no
| LIMIT 5
```

This example filters rows where the `author` field matches "Faulkner," keeps the `book_no` and `author` columns, sorts by `book_no`, and limits the output to 5 rows.