How can I build a regex to match a value?

I need a regex that matches this kind of strings:

brand-new-car
brand-new-car-1
brand-new-car-100
307

and I just need to catch the "name" regardless of whether the string has -count; like 开发者_开发百科this:

brand-new-car
brand-new-car
brand-new-car
307

This regex does not work properly. Its $1 is the full string, not without -count.

(\S+)(?:-\d+|)$

You need to make the first capture group "lazy" or non-greedy.

var re = new RegExp("^(\\S+?)(?:-\\d+)?$");

var testStrings = [
    "brand-new-car",
    "brand-new-car-1",
    "brand-new-car-100",
    "307"
];

for (var i=0; i<testStrings.length; i++) {
    var result = re.exec(testStrings[i]);
    say("result: " + result);
}

The results:

result: brand-new-car,brand-new-car
result: brand-new-car-1,brand-new-car
result: brand-new-car-100,brand-new-car
result: 307,307

Try this (?xms)(^[\w-]+.*?)(?=[\w-]+|\Z) Here, below is an image of regex buddy

where you can catch the "name" regardless of whether the string has -count the yellow and blue foreground highlights the different selections.

Just remove the pipe '|', then it works

(\S+)(?:-\d+)$

Checked here rubular