Golang正则替换与匹配实战技巧

matched, err := regexp.MatchString(`\d+`, "abc123")
if err != nil {
    log.Fatal(err)
}
fmt.Println(matched) // 输出: true

r, err := regexp.Compile(`[a-z]+`)
if err != nil {
    log.Fatal(err)
}
fmt.Println(r.MatchString("hello"))  // true
fmt.Println(r.FindString("abc123def")) // abc

r := regexp.MustCompile(`(\d{4})-(\d{2})-(\d{2})`)
matches := r.FindStringSubmatch("日期是2023-10-01")
if len(matches) > 0 {
    fmt.Println("年:", matches[1]) // 2023
    fmt.Println("月:", matches[2]) // 10
    fmt.Println("日:", matches[3]) // 01
}

r := regexp.MustCompile(`\s+`)
result := r.ReplaceAllString("a  b   c", "-")
fmt.Println(result) // a-b-c

result = r.ReplaceAllStringFunc("10 20 30", func(s string) string {
    num, _ := strconv.Atoi(s)
    return fmt.Sprintf("%d", num*2)
})
fmt.Println(result) // 204060（注意空格也被替换了）

r := regexp.MustCompile(`(\w+)@(\w+\.\w+)`)
result = r.ReplaceAllString("email: john@example.com", "user-$1@mask.com")
fmt.Println(result) // email: user-john@mask.com