Javascript regex match number after string

Question

I have this string

/results?radius=4000&newFilter=true

and I need to replace radius=4000 with radius=n where n is a variable.

How can I use String.replace() method with regex to match that part?

Answer 1

You can use /radius=\d+/ to match "radius=" followed by any number of digits. With this we can use the replace() method to replace it with the desired value:

var str = "/results?radius=4000&newFilter=true";
var replacement = 123;

var newStr = str.replace(/radius=\d+/, "radius=" + replacement);

console.log(newStr);