How to Properly Construct a Regex Query for Substring Search in MongoDB Go Driver?

Retrieving Data Using a Regex Query in Go MongoDB Driver

When querying a database for specific documents using a substring search, it's essential to construct the query correctly to achieve the desired results. This article explores the usage of the MongoDB Go driver to execute a regex query and highlights a potential issue and its solution.

In the provided code snippet, the attempt to retrieve entries containing "he" using a regex query is not working. The issue lies within the construction of the BSON document used for filtering.

The primitive.Regex struct expects the Pattern field to be a string without leading and trailing slashes. The current code attempts to use a string with slashes, which is incorrect. To resolve this, the following adjustment should be made:

<code class="go">filter := bson.D{{"text", primitive.Regex{Pattern: "he", Options: ""}}}</code>

With this modification, the code will correctly construct a BSON filter that can be used for regex queries. The query will match documents where the text field contains the substring "he" and return the expected results.

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