JavaScript match substring after RegExp

Question

I have a string that look something like

something30-mr200

I would like to get everything after the mr (basically the # followed by mr) *always there is going to be the -mr

Any help will be appreciate it.

Answer 1

You can use a regexp like the one Bart gave you, but I suggest using match rather than replace, since in case a match is not found, the result is the entire string when using replace, while null when using match, which seems more logical. (as a general though).

Something like this would do the trick:

function getNumber(string) {
    var matches = string.match(/-mr([0-9]+)/);
    return matches[1];
}
console.log(getNumber("something30-mr200"));

Answer 2

var result = "something30-mr200".split("mr")[1];

or

var result = "something30-mr200".match(/mr(.*)/)[1];

Answer 3

Why not simply:

-mr(\d+)

Then getting the contents of the capture group?