How do I get a number based on the numbers on the end of a string?

Question

I have couple of strings which I want to separate out the numbers from last position. If the string doesn't end with a number, 0 or false should be returned.

Here are some examples:

• string "A1C10" should return 10
• string "20AX23" should return 23
• string "15AZC" should return 0 or false

Answer 1

You could use match here:

var inputs = ["A1C10", "20AX23", "15AZC"];
var outputs = inputs.map(x => x.match(/\d+$/) ? x.match(/\d+$/)[0] : "0");
console.log(outputs);

For your new requirement, we can split the input on (?<=\D)(?=\d*$):

var inputs = ["A1C10", "20AX23", "15AZC"];
for (var i=0; i < inputs.length; ++i) {
    var parts = inputs[i].split(/(?<=\D)(?=\d*$)/);
    if (parts.length == 1) parts.push("0");
    console.log(inputs[i] + " => " + parts);
}