How to remove empty lines from textarea in golang

In actual development, we often need to process the data or text input by the user, and during the processing process, we may encounter situations where there are redundant blank lines in the input content. At this time, we need to pass these through code. Remove blank lines to facilitate subsequent processing.

When using Golang to develop web applications, the <textarea></textarea> tag is often used in the page. When the user inputs multiple lines of content, the tag will automatically generate blank lines, resulting in data Transmission and subsequent processing become complicated. Therefore, this article will explain how to use Golang to remove blank lines in the <textarea></textarea> tag.

1. Problem Analysis

Usually, when users enter multiple lines of text in the <textarea></textarea> tag, they will press the Enter key to change the line, thereby changing the text Generate multiple \n, that is, empty lines. At this time, we need to remove these blank lines to facilitate subsequent program processing.

The following is an example:

<textarea>
    第一行内容
    
    第三行内容（此处有两个空行）
</textarea>

The input content in the above example contains 2 blank lines. How can I remove these empty lines using Golang code? Next, we'll do it step by step.

2. Solution

In response to the above problem, we can remove the blank lines in the <textarea></textarea> tag through the following methods:

1. Use regular expressions to remove blank lines

Regular expression is a pattern that can match text fragments. It can be used to find specific characters or strings in the text and perform corresponding operations. .

In Golang, we can use the ReplaceAllString function of regular expressions to replace empty lines in the text with specified characters, for example:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    str := "第一行内容\n\n第三行内容（此处有两个空行）"
    reg := regexp.MustCompile(`\n+`)
    newStr := reg.ReplaceAllString(str, "\n")
    fmt.Println(newStr)
}

In the above code , we use the regular expression \n to match multiple empty lines, and use \n to replace them with one empty line. In this way, we successfully removed multiple blank lines.

2. Use string interception to remove empty lines

In Golang, the strings package of strings can be used to intercept strings very conveniently , replacement and other operations. Therefore, we can use the functions in the strings package to remove blank lines from the text.

The following is an example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "第一行内容\n\n第三行内容（此处有两个空行）"
    lines := strings.Split(str, "\n")
    var newLines []string
    for _, line := range lines {
        if strings.TrimSpace(line) != "" {
            newLines = append(newLines, line)
        }
    }
    newStr := strings.Join(newLines, "\n")
    fmt.Println(newStr)
}

In the above code, we first use the strings.Split function to split the text into multiple lines, and then iterate through each line. If the line If the content is not empty, it will be saved in newLines. Finally, we use the strings.Join function to splice the text in newLines into one line and output it.

3. Summary

This article introduces the solution of using regular expressions and string interception to solve the problem of removing empty lines of <textarea></textarea> tags in Golang. . Through the introduction of this article, I believe that readers have understood how to remove redundant blank lines in Golang, and can flexibly apply it in actual development. If readers have any questions or suggestions about the content of this article, you are also welcome to leave a message in the comment area to learn and make progress together.

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