\d

str := "/tmp/go-build12312412"
str2 := "/tmp/go-uild12312412"

sampleRegexp  := regexp.MustCompile(`/tmp/go-build\d`)

fmt.println(sampleRegexp.MatchString(str)) // true

fmt.println(sampleRegexp.MatchString(str2)) // false

참고

https://golangbyexample.com/golang-regex-match-number/