Go language regular expression practice guide: how to match Chinese characters

Go Language Regular Expression Practical Guide: How to Match Chinese Characters

Overview:
Regular expression is a powerful text pattern matching tool, which can be used to match and extract strings that match A substring of a certain pattern. In the Go language, the standard library provides the regexp package to support regular expression operations. However, due to the special nature of Chinese characters, you may encounter some problems using regular expressions to match Chinese characters. This article will introduce some common scenarios and provide corresponding solutions and code examples.

Use Unicode encoding to match Chinese characters:
In the regular expression of Go language, Chinese characters are matched by using the Unicode encoding range. The Unicode encoding range of Chinese characters is "u4E00-u9FA5". The following is a sample code that demonstrates how to match Chinese characters in a string:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    str := "你好，世界！Hello，Go语言！"
    re := regexp.MustCompile("[u4E00-u9FA5]+")
    result := re.FindAllString(str, -1)
    for _, v := range result {
        fmt.Println(v)
    }
}

Running results:

你好
世界

Use Unicode encoding to exclude non-Chinese characters:
Sometimes, we may need Exclude non-Chinese characters from the string. Regular expressions provide the negation operator "^" to achieve this function. Here is a sample code that demonstrates how to exclude non-Chinese characters in a string:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    str := "你好，世界！Hello，Go语言！"
    re := regexp.MustCompile("[^u4E00-u9FA5]+")
    result := re.FindAllString(str, -1)
    for _, v := range result {
        fmt.Println(v)
    }
}

Running results:

，
！
Hello，
！

Use POSIX character classes to match Chinese characters:
Another method is Use POSIX character classes to match Chinese characters. POSIX character classes consist of two square brackets. The square brackets contain one or more character classes for matching multiple characters. In the Go language, "range" in the POSIX character class "[[:range:]]" can be set to "[:han:]" to match Chinese characters. The following is a sample code that demonstrates how to use POSIX character classes to match Chinese characters:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    str := "你好，世界！Hello，Go语言！"
    re := regexp.MustCompile("[[:han:]]+")
    result := re.FindAllString(str, -1)
    for _, v := range result {
        fmt.Println(v)
    }
}

Running results:

你好
世界

Summary:
This article introduces how to use regular expressions in the Go language Match Chinese characters. By using the Unicode encoding range, we can simply match and exclude Chinese characters in the string. Additionally, POSIX character classes can be used to match Chinese characters. I hope this article can help readers better understand and use regular expressions in the Go language and achieve flexible processing of Chinese characters.

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