Use the strings.LastIndexAny function to return the last occurrence of the specified character set in a string

Use the strings.LastIndexAny function to return the last occurrence position of the specified character set in the string

In the strings package of the Go language, there is a very useful function strings.LastIndexAny, which is used to return the last occurrence of the specified character set in the string. Specifies the position of the last character in the character set. This function can help us quickly locate the position of characters in the string, making it easier for us to perform subsequent processing.

First, let's take a look at the basic usage of the strings.LastIndexAny function. The function is defined as follows:

func LastIndexAny(s, chars string) int

Among them, s represents the string to be retrieved, and chars represents a character set. This function will start from the end of the string s, search in reverse for any character in the character set chars, and return the position of the last character. If string s does not contain any characters in chars, then -1 is returned.

The following is a simple sample code that demonstrates how to use the strings.LastIndexAny function to return the position of the last character in a string in a specified character set.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, World!"
    chars := "od"

    index := strings.LastIndexAny(str, chars)

    if index != -1 {
        fmt.Printf("最后一个在字符集中的字符的位置为：%d
", index)
        fmt.Printf("字符为：%c
", str[index])
    } else {
        fmt.Println("字符串中没有包含字符集中的任何字符。")
    }
}

In this example, our string is "Hello, World!" and the character set is "od". We use the strings.LastIndexAny function to reversely search this character set in the string and return the position of the last character in the character set. Finally, we output the position of the character and the character itself.

Run the above code, you will get the following output:

最后一个在字符集中的字符的位置为：12
字符为：d

As can be seen from the output, the last character in the string "Hello, World!" is in the character set "od" The character is 'd' and its position is 12.

To summarize, by using the strings.LastIndexAny function, we can quickly and easily find the position of the last character of the specified character set in a string. This function is very useful in actual development. I hope this article can help you.

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