go-正则

import (
	"fmt"
	"regexp"
)

const text = `
my email is ccmouse@gmail.com@abc.com
email1 is abc@def.org
email2 is    kkk@qq.com
email3 is ddd@abc.com.cn
`

func main() {
	re := regexp.MustCompile(
		`([a-zA-Z0-9]+)@([a-zA-Z0-9]+)(\.[a-zA-Z0-9.]+)`)
	match := re.FindAllStringSubmatch(text, -1)
	for _, m := range match {
		fmt.Println(m)
	}
}

输出：

[ccmouse@gmail.com ccmouse gmail .com]
[abc@def.org abc def .org]
[kkk@qq.com kkk qq .com]
[ddd@abc.com.cn ddd abc .com.cn]