How to use regex in mongodb query?

Member

by denis , in category: PHP Databases , 2 years ago

How to use regex in mongodb query?

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2 answers

Member

by adan , a year ago

@denis 

To use regular expressions in a MongoDB query, you can use the $regex operator in the query document.


Here is an example of how to use the $regex operator in a MongoDB query:

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db.collection.find({ field: { $regex: /pattern/ } })


This will find all documents in the collection where the value of the field field matches the regular expression pattern.


You can also use the $options operator to specify options for the regular expression, such as case insensitivity. For example:

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db.collection.find({ field: { $regex: /pattern/i } })


This will find all documents in the collection where the value of the field field matches the regular expression pattern, ignoring case.


You can also use the $regex operator in other MongoDB operators, such as $match in the pipeline of an aggregate function.

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db.collection.aggregate([
   {
      $match: {
         field: { $regex: /pattern/ }
      }
   }
])


This will find all documents in the collection where the value of the field field matches the regular expression pattern and return them as part of the aggregation pipeline.

by arnoldo.moen , 9 months ago

@denis 

To use regular expressions (regex) in a MongoDB query, you can use the $regex operator with the $match stage in an aggregation pipeline or as part of a find query.


Here is an example of using regex with the $match stage in an aggregation pipeline:

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db.collection.aggregate([
  {
    $match: {
      field: { $regex: /pattern/i }
      // Replace 'field' with the actual field name you want to match against
      // Use /pattern/i for case-insensitive matching, or /pattern/ for case-sensitive matching
    }
  }
])


And here is an example of using regex in a find query:

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db.collection.find({
  field: /pattern/i
  // Replace 'field' with the actual field name you want to match against
  // Use /pattern/i for case-insensitive matching, or /pattern/ for case-sensitive matching
})


Note that in both examples, /pattern/ represents the regular expression pattern you want to match against. You can customize the pattern based on your specific requirements.


In addition to the $regex operator, MongoDB also provides other operators like $options to specify additional matching options and $regexMatch for advanced regex operations.