package main

import (
	"fmt"
	"regexp"
)

func main() {

	html := `aaaaaaaa
<link rel="stylesheet" href="https://example.com/wp-content/themes/my-theme/style.css" type="text/css" media="all">
aaaaaaaaaaa`

	re := regexp.MustCompile(`wp-content\/themes\/(.+?)\/`)
	result := re.FindStringSubmatch(html)

	if len(result) > 1 {
		themeName := result[1]
		fmt.Println(themeName)
	} else {
		fmt.Println("Theme name not found")
	}

}