how to pass a variable to a regex

Question

I have a find statement like this

collSession.find({"Venue.type": /.*MT.*/}).toArray(function (err, _clsSession)
        {
            console.log(_clsSession);
        });

It is giving answer.But i need to some value of variable instead of that harcoded value MT. How to achieve this ? Thanks.

UPDATE I tried like "/."+searchterm+"./" Its not working.

Answer 1

Instead of using the inline syntax to create a regular expression, you can also use the RegExp object to create one based on a string

var searchPhrase = "MT";
var regularExpression = new RegExp(".*" + searchPhrase + ".*");
collSession.find({"Venue.type": regularExpression}) [...]

Answer 2

Try this:

  var pattern = 'concatenate string' + here,
        regexp = new Regexp(pattern);

Answer 3

Replace /.*MT.*/ with new RegExp( ".*" + variable + ".*" )

Answer 4

Finally i got from here

it is "Venue.type": new RegExp(queryParams.et)