Get regexp group only if matching

Question

I have two strings

"#string1" (1111) {string2}
"#string1" (1111)

I'd like to write regex that would match three groups. For first string:

1 => #string1
2 => 1111
3 => string2

and for second string

1 => #string1
2 => 1111
3 =>

The problem is I can't figure out how to produce all three groups but make the third one empty if the string doesn't contain curly braces. I can either match all three groups for first string and none for the second or match first two groups for both strings.

How should me regexp look like?

Answer 1

尝试：

^"([^"]*)" \(([^)]*)\)(?: \{([^}]*)\})?$