GoLang strings包函数用法

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package main

import (

"fmt"
"strings"
//"unicode/utf8"

)

func main() {

fmt.Println("查找子串是否在指定的字符串中")
fmt.Println(" Contains 函数用法")
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 这里要特别注意
fmt.Println(strings.Contains("我是中国人","我"))     //true

fmt.Println("")
fmt.Println(" ContainsAny 函数用法")
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

fmt.Println("")
fmt.Println(" ContainsRune 函数用法")
fmt.Println(strings.ContainsRune("我是中国",'我')) // true 注意第二个参数,用的是字符

fmt.Println("")
fmt.Println(" Count 函数用法")
fmt.Println(strings.Count("cheese","e")) // 3 
fmt.Println(strings.Count("five",""))    // before & after each rune result: 5,源码中有实现

fmt.Println("")
fmt.Println(" EqualFold 函数用法")
fmt.Println(strings.EqualFold("Go","go")) //大小写忽略 

fmt.Println("")
fmt.Println(" Fields 函数用法")
fmt.Println("Fields are: %q",strings.Fields("  foo bar  baz   ")) //["foo" "bar" "baz"] 返回一个列表

//相当于用函数做为参数,支持匿名函数
for _,record := range []string{" aaa*1892*122","aaa\taa\t","124|939|22"} {
    fmt.Println(strings.FieldsFunc(record,func(ch rune) bool {
        switch {
        case ch > '5':
            return true
        }
        return false
    }))
}

fmt.Println("")
fmt.Println(" HasPrefix 函数用法")
fmt.Println(strings.HasPrefix("NLT_abc","NLT")) //前缀是以NLT开头的

fmt.Println("")
fmt.Println(" HasSuffix 函数用法")
fmt.Println(strings.HasSuffix("NLT_abc","abc")) //后缀是以NLT开头的

fmt.Println("")
fmt.Println(" Index 函数用法")
fmt.Println(strings.Index("NLT_abc","abc")) // 返回第一个匹配字符的位置,这里是4
fmt.Println(strings.Index("NLT_abc","aaa")) // 在存在返回 -1
fmt.Println(strings.Index("我是中国人","中"))     // 在存在返回 6

fmt.Println("")
fmt.Println(" IndexAny 函数用法")
fmt.Println(strings.IndexAny("我是中国人","中")) // 在存在返回 6
fmt.Println(strings.IndexAny("我是中国人","和")) // 在存在返回 -1

fmt.Println("")
fmt.Println(" Index 函数用法")
fmt.Println(strings.IndexRune("NLT_abc",'b')) // 返回第一个匹配字符的位置,这里是4
fmt.Println(strings.IndexRune("NLT_abc",'s')) // 在存在返回 -1
fmt.Println(strings.IndexRune("我是中国人",'中'))   // 在存在返回 6

fmt.Println("")
fmt.Println(" Join 函数用法")
s := []string{"foo","bar","baz"}
fmt.Println(strings.Join(s,",")) // 返回字符串:foo,bar,baz 

fmt.Println("")
fmt.Println(" LastIndex 函数用法")
fmt.Println(strings.LastIndex("go gopher","go")) // 3

fmt.Println("")
fmt.Println(" LastIndexAny 函数用法")
fmt.Println(strings.LastIndexAny("go gopher","go")) // 4
fmt.Println(strings.LastIndexAny("我是中国人","中"))      // 6

fmt.Println("")
fmt.Println(" Map 函数用法")
rot13 := func(r rune) rune {
    switch {
    case r >= 'A' && r <= 'Z':
        return 'A' + (r-'A'+13)%26
    case r >= 'a' && r <= 'z':
        return 'a' + (r-'a'+13)%26
    }
    return r
}
fmt.Println(strings.Map(rot13,"'Twas brillig and the slithy gopher..."))

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

fmt.Println("")
fmt.Println(" Replace 函数用法")
fmt.Println(strings.Replace("oink oink oink","k","ky",2))
fmt.Println(strings.Replace("oink oink oink","oink","moo",-1))

fmt.Println("")
fmt.Println(" Split 函数用法")
fmt.Printf("%q\n",strings.Split("a,b,c","))
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"))

fmt.Println("")
fmt.Println(" SplitAfter 函数用法")
fmt.Printf("%q\n",strings.SplitAfter("/home/m_ta/src","/")) //["/" "home/" "m_ta/" "src"]

fmt.Println("")
fmt.Println(" SplitAfterN 函数用法")
fmt.Printf("%q\n",strings.SplitAfterN("/home/m_ta/src","/",2))  //["/" "home/m_ta/src"]
fmt.Printf("%q\n",strings.SplitAfterN("#home#m_ta#src","#",-1)) //["/" "home/" "m_ta/" "src"]

fmt.Println("")
fmt.Println(" SplitN 函数用法")
fmt.Printf("%q\n",strings.SplitN("/home/m_ta/src",1))

fmt.Printf("%q\n",2))  //["/" "home/" "m_ta/" "src"]
fmt.Printf("%q\n",-1)) //["" "home" "m_ta" "src"]
fmt.Printf("%q\n",strings.SplitN("home,m_ta,src",2))   //["/" "home/" "m_ta/" "src"]

fmt.Printf("%q\n",strings.SplitN("#home#m_ta#src",-1)) //["/" "home/" "m_ta/" "src"]

fmt.Println("")
fmt.Println(" Title 函数用法") //这个函数,还真不知道有什么用
fmt.Println(strings.Title("her royal highness"))

fmt.Println("")
fmt.Println(" ToLower 函数用法")
fmt.Println(strings.ToLower("Gopher")) //gopher 

fmt.Println("")
fmt.Println(" ToLowerSpecial 函数用法")

fmt.Println("")
fmt.Println(" ToTitle 函数用法")
fmt.Println(strings.ToTitle("loud noises"))
fmt.Println(strings.ToTitle("loud 中国"))

fmt.Println("")
fmt.Println(" Replace 函数用法")
fmt.Println(strings.Replace("ABAACEDF","A","a",2)) // aBaACEDF
//第四个参数小于0,表示所有的都替换, 可以看下golang的文档
fmt.Println(strings.Replace("ABAACEDF",-1)) // aBaaCEDF

fmt.Println("")
fmt.Println(" ToUpper 函数用法")
fmt.Println(strings.ToUpper("Gopher")) //GOPHER

fmt.Println("")
fmt.Println(" Trim  函数用法")
fmt.Printf("[%q]",strings.Trim(" !!! Achtung !!! ","! ")) // ["Achtung"]

fmt.Println("")
fmt.Println(" TrimLeft 函数用法")
fmt.Printf("[%q]",strings.TrimLeft(" !!! Achtung !!! ","! ")) // ["Achtung !!! "]

fmt.Println("")
fmt.Println(" TrimSpace 函数用法")
fmt.Println(strings.TrimSpace(" \t\n a lone gopher \n\t\r\n")) // a lone gopher

}

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