Regular expression: capture group might not exist. How do I write it?

Question

Here are some examples of the strings I need to parse:

1 - Cream Soda (0.99)
5 - Potato Chips (2.50)
12 - Atlantic Salmon

I want to capture the first numeral, the product name and the price including parentheses. Sometimes the price and associated parentheses don't exist.

I came up with this regex:

/(\d+)\s+-\s*(.+)\s+(\(.*\))/

which works only when all three groups exist. I also tried this:

/(\d+)\s+-\s*(.+)\s+(\(.*\))?/

but its not any better.

How do I make the third capture group optional?

This is in javascript if it makes any difference.

Answer 1

You can make 2nd group lazy and use line end as alternate match in 3rd group:

(\d+)\s+-\s*(.+?)\s*(\(.*\)|$)

RegEx Demo