JavaScript - Regex, is there a marker for any string?

Question

str.replace(/\w*(\ || --> A marker whitch can represent any char or string? <-- || )/g, function() {return "(" + arguments[0] + ")"})

Answer 1

The dot (.) matches any (1) character; .+ matches a string of at least length 1, .* matches a string of at least length 0.