Add specific special characters parenthesis ( ) in Regex

Question

Currently, I have this regex for telephone number

/^\+?\d+(-\d+)*$/

which allows:

123
123-456
123-456-789

I'm aiming to also accept parenthesis in my regex ( ) for example:

(02)123-456

How can I do it with my current regex?

Answer 1

Add/Append (\\(\\d+\\))? in front of /^\\+?\\d+(-\\d+)*$/

If you need min. 2 numbers, use this (\\(\\d{2,}\\))?

Basically, you need to escape the () , remember that in almost any language you would do it with the \\ -character. From then on you only need to specify the number of occurrences.