Does anyone know how to insert a variable(a string) into a regular expression statement and then take that regex expression (not a string data type) and put it in a javaobject ? I am using MongoDB (it's an already made db I am only querying against) and to query a colleciton I need to use RegEx. I have the expression I need but it needs to be dy…

moreinfo.md

when I sent a post with {"username":"blah"} as the payload I need a response of

{
    "title": /.*@blah.*/i,
    "$or": [
        {
            "body": /.*@blah.*/i
        }
    ]
}

But I get

{
    "title": "/.*@blah.*/i",
    "$or": [
        {
            "body": "/.*@blah.*/i"
        }
    ]
}

which won't work as a query.

server.js

app.post('/mentions', function(req,res){
	
	var username = req.body.username;

	var titleRegex = "/.*@"+username+".*/i";

	var titleRegexObj = new RegExp(titleRegex);

  var query = {
		"title": titleRegex,
		$or: [
			{
				"body": titleRegex
			}
		]
	};

	res.send(query);
  
 

});