MongoDB Regular Expression Search - Starts with using javascript driver and NodeJS

Question

I\'m using the JavaScript mongodb driver from nodejs. I want to do this query in my JavaScript function:

db.mycollection.find({Zip:/^94404/}); 

Answer 1

$options => i for case insensitive search

Start with string

db.collection.find({zip:{'$regex' : '^string', '$options' : 'i'}})

End with string

db.collection.find({zip:{'$regex' : 'string$', '$options' : 'i'}})

Contains string

db.collection.find({zip:{'$regex' : 'string', '$options' : 'i'}})

Doesn't Contains string

db.collection.find({zip:{'$regex' : '^((?!string).)*$', '$options' : 'i'}})

Keep this as a bookmark, and a reference for any other alterations you may need. http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/

Answer 2

You almost have it. You keep ending up with a regex inside a string and looking for the string '/^94404/' going to find anything unless you have some strange looking zip codes.

The easiest way to build a regex object from a string in JavaScript is to use new RegExp(...):

var query = { Zip: new RegExp('^' + zipCode) };

Then you can:

collection.find(query).toArray(...)

That sort of thing works in the MongoDB shell and similar things work in the Ruby interface so it should work in the JavaScript interface as well.