golang语言渐入佳境[22]-string检索类函数

package mainimport (	"fmt"	"strings"	"unicode")/*1、func Contains(s, substr string) bool判断字符串s是否包含substr字符串2、func ContainsAny(s, chars string) bool判断字符串s是否包含chars字符串中的任一字符3、func ContainsRune(s string, r rune) bool判断字符串s是否包含unicode码值r4、func Count(s, sep string) int返回字符串s包含字符串sep的个数5、func HasPrefix(s, prefix string) bool判断字符串s是否有前缀字符串prefix6、func HasSuffix(s, suffix string) bool判断字符串s是否有后缀字符串suffix7、func Index(s, sep string) int返回字符串s中字符串sep首次出现的位置8、func IndexAny(s, chars string) int返回字符串chars中的任一unicode码值r在s中首次出现的位置9、func IndexByte(s string, c byte) int返回字符串s中字符c首次出现位置10、func IndexFunc(s string, f func(rune) bool) int返回字符串s中满足函数f(r)==true字符首次出现的位置11、func IndexRune(s string, r rune) int返回unicode码值r在字符串中首次出现的位置12、func LastIndex(s, sep string) int返回字符串s中字符串sep最后一次出现的位置13、func LastIndexAny(s, chars string) int返回字符串s中任意一个unicode码值r最后一次出现的位置14、func LastIndexByte(s string, c byte) int返回字符串s中字符c最后一次出现的位置15、func LastIndexFunc(s string, f func(rune) bool) int返回字符串s中满足函数f(r)==true字符最后一次出现的位置 */func main() {	TestLastIndexFunc()}func TestContains() {	fmt.Println(strings.Contains("seafood", "foo"))//true	fmt.Println(strings.Contains("seafood", "bar"))//false	fmt.Println(strings.Contains("seafood", ""))//true	fmt.Println(strings.Contains("", ""))//true	fmt.Println(strings.Contains("jonson郑2008", "郑"))//true}func TestContainsAny() {	fmt.Println(strings.ContainsAny("team", "i"))//false	fmt.Println(strings.ContainsAny("failure", "u & i"))//true	fmt.Println(strings.ContainsAny("foo", ""))//false	fmt.Println(strings.ContainsAny("", ""))//false}func TestContainsRune() {	fmt.Println(strings.ContainsRune("一丁丂", '丁'))//true	fmt.Println(strings.ContainsRune("一丁丂", 19969))//true}func TestCount() {	fmt.Println(strings.Count("cheese", "e"))//3	fmt.Println(strings.Count("one", ""))//4}func TestHasPrefix() {	fmt.Println(strings.HasPrefix("1000phone news", "1000"))//true	fmt.Println(strings.HasPrefix("1000phone news", "1000a"))//false}func TestHasSuffix() {	fmt.Println(strings.HasSuffix("1000phone news", "news"))//true	fmt.Println(strings.HasSuffix("1000phone news", "new"))//false}func TestIndex() {	fmt.Println(strings.Index("chicken", "ken"))//4	fmt.Println(strings.Index("chicken", "dmr"))//-1}func TestIndexAny() {	fmt.Println(strings.IndexAny("abcABC120", "教育基地A"))//3}func TestIndexByte() {	fmt.Println(strings.IndexByte("123abc", 'a'))//3}func TestIndexRune() {	fmt.Println(strings.IndexRune("abcABC120", 'C'))//5	fmt.Println(strings.IndexRune("It培训教育", '教'))//8}func TestIndexFunc() {	f := func(c rune) bool {		return unicode.Is(unicode.Han , c)	}	fmt.Println(strings.IndexFunc("Hello123,中国" , f))//9}func TestLastIndex() {	fmt.Println(strings.LastIndex("jonson learn english", "e"))//13	fmt.Println(strings.Index("go gopher", "go"))//0	fmt.Println(strings.LastIndex("go gopher", "go"))//3	fmt.Println(strings.LastIndex("go gopher", "rodent"))//-1}func TestLastIndexAny() {	fmt.Println(strings.LastIndexAny("chicken", "aeiouy"))//5	fmt.Println(strings.LastIndexAny("crwth", "aeiouy"))//-1}func TestLastIndexByte() {	fmt.Println(strings.LastIndexByte("abcABCA123", 'A'))//6}func TestLastIndexFunc() {	f := func(c rune) bool {		return unicode.Is(unicode.Han, c)	}	fmt.Println(strings.LastIndexFunc("Hello,世界", f))//9	fmt.Println(strings.LastIndexFunc("Hello,world中国人", f))//17}