Question

I am having issues searching for a variable within a variable. The code that I have is:

var str = "13, 12, 12, 12";

//Look for string = 13 in str.
var string = 13;

var patt = "/" + string + "/g";
var result = patt.test(str);

What is my error?

Answer 1

Use

var patt = new RegExp(string, 'g');

to build your pattern. The /something/g construct cannot be used for dynamic patterns.

See MDN’s documentation on regular expressions.