= 20 AND sale = FALSE; db.inventory.find( { $nor: [ { price: 1.99 }, { qty: { $lt: 20 } }, { sale: true } ] } ). sorry I can't reproduce myself neither. 's' - allows . Here, we have special character $ in our string. MongoDB regex based queries are a fairly common query in most applications using MongoDB. An opening parenthesis along with a number of other characters in RegEx has a special reserved function, so it must be ‘escaped’ by a preceding \. Sorry I reopen, I've just noticed this code doesn't work if I have special char in the user name in the db ( "Micke[y] mouse"). $regex: new RegExp('^' + name.replace(/[-/\^$*+?. How to add space before and after specific character using regex in Python? SELECT * FROM inventory WHERE qty IN (5, 15); db.inventory.find( { qty: { $in: [ 5, 15 ] } } ). 153 1 1 gold badge 2 2 silver badges 7 7 bronze badges \$\endgroup\$ add a comment | 1 Answer Active Oldest Votes. The full process name returned from "pgrep -f -l" can return a process which has a embedded regex expressions. However these MongoDB regex queries have a downside, all but one type of regex makes poor use of indexes and results in performance problems. This work with mongoose aggregate $match also. SELECT * FROM inventory WHERE qty < 20 OR price = 10; db.inventory.find( { $or: [ { qty: { $lt: 20 } }, { price: 10 } ] } ). Or submit a message to him via the contact form on the, db.inventory.find( { qty: { $eq: 20 } } ), db.inventory.find( { qty: { $ne: 20 } } ), UPDATE inventory SET price = 9.99 WHERE carrier.fee > 2, db.inventory.update( { "carrier.fee": { $gt: 2 } }, { $set: { price: 9.99 } } ), db.inventory.find( { qty: { $lt: 20 } } ). We use lots of special characters and Metacharacters with regular expressions in Java. ()|[]{}]/g, '\$&') + '$', 'i') to your account. The module is pretty much the same thing: https://github.com/component/escape-regexp/blob/master/index.js . LIKE performs two kinds of matches: _ - the underscore, matching a single character % - the percentage sign, matching any number of characters. https://github.com/component/escape-regexp/blob/master/index.js. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Suppose, we developed an ETL tool that inserting records on a daily basis in the PostgreSQL table from the CSV file. SELECT * FROM inventory WHERE price > 19.99 AND category IN ('liquor', 'liqueur'); db.inventory.find( { $and: [ { price: { $gt: 19.99 } }, { category: { $in: ['liquor', 'liqueur'] } } ] } ). 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