Answer
$regex performs pattern matching on string fields and is useful for partial text searches.
Quick Answer
$regex filters documents where a string field matches a regular expression. db.users.find({name: {$regex: "^alice", $options: "i"}}) finds users whose name starts with "alice" (case-insensitive). Performance warning: regex queries without a text index or leading wildcard can't use indexes and cause full collection scans. Anchor patterns to the start (^) when possible.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ