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The query works in mongo console : db.blogs.find({title : /fun/i}); but I tried to use it in nodejs, it won't work if I do it as : 

var keyword = "fun";

query = { "title" : "/"+keyword+"/i" }; //doesn't work

query = { "title" : /fun/i };  //works, but I need to use the variable name - keyword
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When dynamically creating a regular expression, you need to use the RegExp constructor instead of the literal notation with the /chars:

var keyword = "fun";
var query = {title: new RegExp(keyword, "i")};
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