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MongoDB Aggregate Match String Contains Options | Guide

Did you know that the $match stage is used to filter documents from a collection according to criteria in MongoDB’s aggregation framework?

If we want to match documents where a certain string field contains a specific substring, we can use the $regex operator within the $match stage.

Furthermore, this allows us to carry out a regular expression-based match on string fields.

Let’s take a look at how to use the $match stage with the $regex operator to perform a string contains operation:

Let’s break down the components:

• db.collection.aggregate:

  This command starts an aggregation pipeline on the specified collection.
• $match:

  Additionally, this is the aggregation stage that filters documents based on a given condition.
• fieldName:

  Replace this with the name of the field we want to search within for the substring.
• $regex:

  This allows us to use a regular expression pattern for matching.
• “substring”:

  Replace this with the substring we want to search for within the specified field.
• $options: “i”:

  This makes the regular expression matching case insensitive. In other words, it will match substrings regardless of their case.

Here’s an example of how to use the $match stage with the $regex operator to find documents where the “title” field contains the substring “mongo”:

This aggregation pipeline returns all documents where the “title” field contains the substring “mongo” (case-insensitive).

Furthermore, our experts would like to point out that using regular expressions for matching can have performance implications, especially on large collections.

If we are performing frequent substring searches, we may have to create indexes to optimize the query’s performance.

Additionally, MongoDB offers other text search capabilities, like full-text search and text indexes, which are better for advanced text search requirements.

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Conclusion

In brief, our Support Techs demonstrated how to use MongoDB Aggregate Match String Contains options.