How to use regular expressions in golang to verify whether the input is UTF-8 encoded text

In golang, regular expressions are widely used for text processing and text validation. When we receive and process input, we need to verify that the input is UTF-8 encoded text. This article will introduce how to use golang's regular expressions to verify whether the input is UTF-8 encoded text.

First, understand what UTF-8 is. UTF-8 is a character set that encodes Unicode characters in bytes. UTF-8 is a variable-length encoding method. For different Unicode characters, UTF-8 uses bytes of different lengths for encoding. For example, UTF-8 uses 1 byte to encode ASCII characters and 3 or 4 bytes to encode larger Unicode characters.

The way to verify UTF-8 encoded text in golang is to use regular expressions to match UTF-8 encoding. The following is a regular expression that matches UTF-8 encoding:

^[\u{0}-\u{10FFFF}]*$

The above regular expression will match all UTF-8 encoded characters, from u{0} to u{10FFFF}, ensuring that every character entered All are valid UTF-8 encodings.

Next, we will write a golang program that uses the above regular expression to verify whether the input text is UTF-8 encoded text.

package main

import (
    "fmt"
    "regexp"
)

func main() {
    inputText := "Hello, 你好!" //UTF-8编码文本
    pattern := "^[\u{0}-\u{10FFFF}]*$"
    matched, err := regexp.MatchString(pattern, inputText)
    if err != nil {
        fmt.Println("error:", err)
        return
    }
    if matched {
        fmt.Println("输入的文本是UTF-8编码的文本。")
    } else {
        fmt.Println("输入的文本不是UTF-8编码的文本。")
    }
}

In the above program, we first define an input text "Hello, Hello!", which contains ASCII characters and Unicode characters. We will use the above regular expression to verify whether this text is UTF- 8 encoded text.

Next, we define the matching pattern as the above regular expression and use the MatchString() function in golang's regexp package to perform matching. If the match is successful, output "The input text is UTF-8 encoded text.", otherwise output "The input text is not UTF-8 encoded text.".

The output of the above program will be "The input text is UTF-8 encoded text.", because the input text is indeed UTF-8 encoded text.

At the end, we summarize the process of using golang's regular expressions to verify whether the input is UTF-8 encoded text. The regular expression we use matches all UTF-8 encoded characters and performs the matching in golang. This method can help us effectively verify whether the input is UTF-8 encoded text and ensure that our program can correctly handle UTF-8 encoded input.

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