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golang finds substring position

WBOY
WBOYOriginal
2023-05-13 10:15:071021browse

golang is a programming language with very high efficiency and performance, and string operations are no exception. If you need to find the substring position of a string in golang, you can use the functions provided by the strings package in the standard library.

The following are several methods for finding the position of substrings in golang:

1. strings.Index function

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello, world"
    substr := "world"
    index := strings.Index(str, substr)

    fmt.Println("substr in str:", index)
}

Running results:

substr in str: 7

strings.Index The function returns the position of the first occurrence of the substring in the string. If the substring is not in the string, it returns -1.

2. strings.LastIndex function

strings.LastIndex function is similar to the strings.Index function, but it searches for substrings starting from the end of the string. string.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello, world, world"
    substr := "world"
    index := strings.LastIndex(str, substr)

    fmt.Println("substr in str:", index)
}

Run result:

substr in str: 13

3. strings.IndexAny function

strings.IndexAny The function is used to find any character in the substring. The position of the first occurrence in the string.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello, world"
    substr := "ow"
    index := strings.IndexAny(str, substr)

    fmt.Println("substr in str:", index)
}

Run result:

substr in str: 4

4. strings.IndexByte function

strings.IndexByte The function is used to find the specified byte in the substring. The position of the first occurrence in the string.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello, world"
    substr := ','
    index := strings.IndexByte(str, substr)

    fmt.Println("substr in str:", index)
}

Run result:

substr in str: 5

5. strings.IndexFunc function

strings.IndexFunc The function is used to find characters in a substring that meet specified conditions. The position of the first occurrence in the string.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello, world"
    substr := func(r rune) bool {
        return r == 'l'
    }
    index := strings.IndexFunc(str, substr)

    fmt.Println("substr in str:", index)
}

Run results:

substr in str: 2

The above are several methods for finding the substring position in golang. Choosing the appropriate method according to different situations can effectively improve the efficiency of the program.

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