Golang intercepts Chinese garbled characters

When using Golang to intercept strings, you may encounter the problem of intercepting Chinese characters, resulting in garbled output. This phenomenon occurs because of Chinese character encoding problems.

Golang uses UTF-8 encoding to represent characters, and a Chinese character consists of three bytes under UTF-8 encoding. Therefore, if you do not pay attention to encoding issues, some unexpected problems will occur when intercepting strings, such as garbled output, incomplete string interception, etc.

The following are some methods to solve the problem of intercepting garbled Chinese characters.

Method 1: Use rune

Rune in Golang represents a Unicode character. If we want to intercept Chinese characters, we can first convert the string to rune type, then intercept the required characters, and finally convert the rune type to string.

Sample code:

package main

import (
    "fmt"
)

func main() {
    str := "Go语言中文网"
    strRune := []rune(str)
    fmt.Println(string(strRune[0:2]))
}

The output result is: Go

The above code first converts the string str to rune type, and then uses string slicing to intercept the first two characters, and finally convert the rune type to string output. Since one Chinese character occupies three bytes, we must choose the correct range when intercepting, otherwise garbled characters will appear.

Method 2: Use the Chinese character length instead of the number of bytes

Since one Chinese character in Golang occupies three bytes, we can use the Chinese character length as the standard when intercepting Chinese characters , rather than in bytes. This method can avoid the problem of garbled characters due to insufficient bytes.

Sample code:

package main

import (
    "fmt"
    "unicode/utf8"
)

func main() {
    s := "Go语言中文网"
    var size int
    for i := range s {
        if size < 2 {
            size++
            continue
        }
        fmt.Println(s[0:i])
        break
    }
    fmt.Println("中文字符数量：", utf8.RuneCountInString(s))
}

The output result is: Go language

This code first uses the RuneCountInString() function in the utf8 library to calculate the number of Chinese characters in the string, Then slice and intercept the appropriate characters according to the length of the Chinese characters.

It should be noted that due to different character encodings, the number of bytes occupied by a Chinese character in different languages ​​may also be different, so we should choose an appropriate method to intercept strings according to the specific situation.

To sum up, we can use rune type or Chinese character length to intercept strings, which can effectively avoid the problem of garbled Chinese characters. Of course, in practical applications, many situations need to be considered to achieve the best results.

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