golang 中strings包的Replace的使用说明

func Replace(s, old, new string, n int) string

func main() {
 // non-overlapping: "123" repeat 6 times in s
 s := "123lafaldsjglad123lkfasdf123djfal123lkdjga123lksjfla123l"
 old := "123"
 new := "888"
 
 fmt.Println("non-overlapping: ")
  // n < 0 ,用 new 替换所有匹配上的 old；n=-1: 888lafaldsjglad888lkfasdf888djfal888lkdjga888lksjfla888l
 fmt.Println("n=-1: ", strings.Replace(s, old, new, -1 ))
 
 // 不替换任何匹配的 old；n=0: 123lafaldsjglad123lkfasdf123djfal123lkdjga123lksjfla123l
 fmt.Println("n=0: ", strings.Replace(s, old, new, 0 )) 

 // 用 new 替换第一个匹配的 old；n=1: 888lafaldsjglad123lkfasdf123djfal123lkdjga123lksjfla123l
 fmt.Println("n=1: ", strings.Replace(s, old, new, 1 ))

 // 用 new 替换前 5 个匹配的 old（实际多于 5 个）；n=5: 888lafaldsjglad888lkfasdf888djfal888lkdjga888lksjfla123l
 fmt.Println("n=5: ", strings.Replace(s, old, new, 5 )) 
 
 // 用 new 替换前 7 个匹配上的 old（实际没那么多）；n=7: 888lafaldsjglad888lkfasdf888djfal888lkdjga888lksjfla888l
 fmt.Println("n=7: ", strings.Replace(s, old, new, 7 )) 

 // overlapping:
 s = "888888888888888888"
 old = "888"
 new = "666"
 fmt.Println("overlapping: ")

 // n < 0 ,用 new 替换所有匹配上的 old；n=-1: 666666666666666666
 fmt.Println("n=-1: ", strings.Replace(s, old, new, -1 )) 

 // 不替换任何匹配的 old；n=0: 888888888888888888
 fmt.Println("n=0: ", strings.Replace(s, old, new, 0 )) 
 
 // 用 new 替换第一个匹配的 old；n=1: 666888888888888888
 fmt.Println("n=1: ", strings.Replace(s, old, new, 1 )) 

  // 用 new 替换前 5 个匹配的 old（实际多于 5 个）；n=5: 666666666666666888
 fmt.Println("n=5: ", strings.Replace(s, old, new, 5 ))

  // 用 new 替换前 7 个匹配上的 old（实际没那么多）；n=7: 666666666666666666
 fmt.Println("n=7: ", strings.Replace(s, old, new, 7 ))
}

func Contains(s, substr string) bool

fmt.Println(strings.Contains("seafood", "foo")) //true

func Join(a []string, sep string) string

s := []string{"foo", "bar", "baz"}
fmt.Println(strings.Join(s, ", ")) //foo, bar, baz

func Index(s, sep string) int

fmt.Println(strings.Index("chicken", "ken")) //4
fmt.Println(strings.Index("chicken", "dmr")) //不包含子串返回-1 

func Repeat(s string, count int) string

fmt.Println("ba" + strings.Repeat("na", 2)) //banana

func Split(s, sep string) []string 

fmt.Printf("%q\n", strings.Split("a,b,c", ",")) //%q 输出格式为:带引号的字符串
fmt.Printf("%q\n", strings.Split("a man a plan a canal panama", "a "))
fmt.Printf("%q\n", strings.Split(" xyz ", ""))
fmt.Printf("%q\n", strings.Split("", "Bernardo O'Higgins"))

["a" "b" "c"]
["" "man " "plan " "canal panama"]
[" " "x" "y" "z" " "]
[""] //若分隔符在原字符串中不存在,返回原字符串切片

func Trim(s string, cutset string) string

fmt.Println(strings.Trim(" !!! Achtung! Achtung! !!! ", "! ")) 
// Achtung! Achtung
// 会去掉字符串两端所有的"!"和" "

func Fields(s string) []string

fmt.Printf("Fields are: %q", strings.Fields(" foo bar baz "))
// Fields are: ["foo" "bar" "baz"]