Why Does My MongoDB-Go-Driver Regex Substring Query Fail to Return Matches?

Find Entries via Substring Regex Query in MongoDB-Go-Driver

Attempting to utilize regex queries within the official MongoDB Go driver can be challenging. This Q&A delves into a specific issue where a user encountered difficulties in retrieving objects matching a regex substring query.

Question:

Why does the provided Go code fail to return matching entries when performing a substring regex query?

Answer:

The code snippet contained a slight error in the primitive.Regex struct configuration. Specifically, the Pattern field must be defined without enclosing slashes. The correct code is:

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

In the original code, the pattern was defined as "/he/", which is incorrect. The primitive.Regex struct accepts the pattern value as a plain string, without any delimiters.

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