Issues with regex. nil slice and FindStringSubmatch

I'm trying to regex a pattern:

random-text (800)

I'm doing something like this:

func main() {
	rando := "random-text (800)"
	parsedThing := regexp.MustCompile(`\((.*?)\)`)
	match := parsedThing.FindStringSubmatch(rando)
	if match[1] == "" {
		fmt.Println("do a thing")
	}
		if match[1] != "" {
		fmt.Println("do a thing")
	}
	
}

I only want to capture what's in the parentheses but FindString is parsing the (). I've also tried FindStringSubmatch, which is great I can specify the capture group in the slice but then I have an error in my unit test, that the slice is . I need to test for an empty string as that's a thing that could happen. Is there a better regex, that I can use that will only capture inside the parentheses? Or is there a better way to error handle for an nil slice.

I usually compare against nil, based on the documentation:

> A return value of nil indicates no match.

package main
import (
   "fmt"
   "regexp"
)
func main() {
   re := regexp.MustCompile(`\((.+)\)`)
   find := re.FindStringSubmatch("random-text (800)")
   if find != nil {
      fmt.Println(find[1] == "800")
   }
}