Allow only numbers/year between rounded brackets

For a website I want to allow only the year of product开发者_如何学Cion between rounded brackets with a RegEx.

Allowed:

Movie 1 (2010)

Disallowed:

Movie 2 (2010 English)

Movie 2 (01-01-2010)

What I want is a RegEx that will detect when letters are between the brackets or a combination of letters, spaces and numbers.

How do I achieve this?

Something like

/^.+\(\d{4}\)$/

This should do just fine:

/\(.*?([0-9]{4}).*?\)/

You can then use $1 to retrieve the year.