golang语言渐入佳境[23]-string分割类函数

package main

import (
	"fmt"
	"strings"
	"unicode"
)

/*
1、func Fields(s string) []string
将字符串s以空白字符分割，返回一个切片

2、func FieldsFunc(s string, f func(rune) bool) []string
将字符串s以满足f(r)==true的字符分割，返回一个切片

3、func Split(s, sep string) []string
将字符串s以sep作为分隔符进行分割，分割后字符最后去掉sep

4、func SplitAfter(s, sep string) []string
将字符串s以sep作为分隔符进行分割，分割后字符最后附上sep

5、func SplitAfterN(s, sep string, n int) []string
将字符串s以sep作为分隔符进行分割，分割后字符最后附上sep，n决定返回的切片数

6、func SplitN(s, sep string, n int) []string
将字符串s以sep作为分隔符进行分割，分割后字符最后去掉sep，n决定返回的切片数
 */

func main() {
	TestSplitAfterN()
}

func TestFields() {
	fmt.Println(strings.Fields("  abc 123 ABC xyz XYZ")) //[abc 123 ABC xyz XYZ]
}

func TestFieldsFunc() {
	f := func(c rune) bool {
		//return c == '='
		return !unicode.IsLetter(c) && !unicode.IsNumber(c)
	}
	fmt.Println(strings.FieldsFunc("abc@123*ABC&xyz%XYZ" , f)) //[abc 123 ABC xyz XYZ]
}

func TestSplit() {
	fmt.Printf("%q\n", strings.Split("a,b,c", ","))//[a b c]
	fmt.Printf("%q\n", strings.Split("a man a plan a canal panama", "a "))//["" "man " "plan " "canal panama"]
	fmt.Printf("%q\n", strings.Split(" xyz ", ""))//[" " "x" "y" "z" " "]
	fmt.Printf("%q\n", strings.Split("", "Bernardo O'Higgins"))//[""]
}

func TestSplitN() {
	fmt.Printf("%q\n", strings.SplitN("a,b,c", ",", 2))//["a"   "b,c"]
	fmt.Printf("%q\n", strings.SplitN("a,b,c", ",", 1))//["a,b,c"]
}

func TestSplitAfter() {
	fmt.Printf("%q\n", strings.SplitAfter("a,b,c", ","))//["a," "b," "c"]
}

func TestSplitAfterN() {
	fmt.Printf("%q\n", strings.SplitAfterN("a,b,c", ",", 2))//["a,"   "b,c"]
}