package main
import "fmt"
import "regexp"
func main() {
	re:=regexp.MustCompile(".com")
	fmt.Println(re.FindString("google.com"))
	fmt.Println(re.FindString("google.org"))
	fmt.Println(re.FindStringIndex("google.com"))
	fmt.Println(re.FindStringIndex("google.org"))
	re1 := regexp.MustCompile("n([a-z]+)ion")  
  fmt.Println(re1.FindStringSubmatch("nation"))  
  re2 := regexp.MustCompile("org([a-z]+)ion") 
  fmt.Println(re2.FindStringSubmatch("organization"))  
  fmt.Println(re.FindAllStringSubmatchIndex("golang.com google.com .com", -1))
  re3,_ := regexp.Compile(" ")
	fmt.Println(re3.ReplaceAllString("a b c d e f","+"))
}