JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = ["PZ13 Bar", "IL0 Foo", "IL10 Baz", "IL3 Bob says hello", "PI0 Bar"];
arr.sort(function (a1, b1) {
    var a = parseInt(a1.match(/\d+/g)[0], 10),
        b = parseInt(b1.match(/\d+/g)[0], 10),
        letterA = a1.charCodeAt(0),
        letterB = b1.charCodeAt(0);
    if (letterA > letterB) {
        return 1;
    } else if (letterB > letterA) {
        return -1;
    } else {
        if (a < b) return -1;
        if (a > b) return 1;
        return 0;
    }
});

document.write(JSON.stringify(arr))