How to perform advanced text processing tasks like Markdown conversion using regular expressions in Golang?

To perform advanced text processing tasks like Markdown conversion using regular expressions in Golang, you can follow these steps:

Import the required packages:

import (
    "regexp"
    "strings"
)

Define the regular expressions for different Markdown elements. For example, to match headings, emphasis, and links:

var (
    headingRegex   = regexp.MustCompile(`^#+\s+(.*)$`)
    emphasisRegex  = regexp.MustCompile(`\*(.*?)\*`)
    linkRegex      = regexp.MustCompile(`\[([^\[]+)\]\(([^\)]+)\)`)
)

Create helper functions to process each type of Markdown element. For example:

func processHeadings(text string) string {
    return headingRegex.ReplaceAllString(text, "<h$1>$2</h$1>")
}

func processEmphasis(text string) string {
    return emphasisRegex.ReplaceAllString(text, "<em>$1</em>")
}

func processLinks(text string) string {
    return linkRegex.ReplaceAllString(text, "<a href=\"$2\">$1</a>")
}

Define the main Markdown conversion function that combines all the processing steps:

func markdownToHTML(markdown string) string {
    lines := strings.Split(markdown, "\n")
    result := ""

    for _, line := range lines {
        line = processHeadings(line)
        line = processEmphasis(line)
        line = processLinks(line)
        result += line + "\n"
    }

    return result
}

Use the markdownToHTML function to convert your Markdown text to HTML:

markdown := "# Example Markdown\n\n**bold text**\n\n[link](http://example.com)"
html := markdownToHTML(markdown)
fmt.Println(html)

This is a basic example that demonstrates how to perform Markdown conversion using regular expressions in Golang. You can expand upon this by adding more regular expressions and processing functions to handle other Markdown elements, such as code blocks or lists.