Compile 系列

func Compile(expr string) (*Regexp, error)
func CompilePOSIX(expr string) (*Regexp, error)
func MustCompile(str string) *Regexp
func MustCompilePOSIX(str string) *Regexp

函数名称中的 Must 表示：如果正则错误，直接 panic

Match 系列

func (re *Regexp) Match(b []byte) bool
func (re *Regexp) MatchReader(r io.RuneReader) bool
func (re *Regexp) MatchString(s string) bool

Find 系列

func (re *Regexp) Find(b []byte) []byte
func (re *Regexp) FindAll(b []byte, n int) [][]byte
func (re *Regexp) FindAllIndex(b []byte, n int) [][]int
func (re *Regexp) FindAllString(s string, n int) []string
func (re *Regexp) FindAllStringIndex(s string, n int) [][]int
func (re *Regexp) FindAllStringSubmatch(s string, n int) [][]string
func (re *Regexp) FindAllStringSubmatchIndex(s string, n int) [][]int
func (re *Regexp) FindAllSubmatch(b []byte, n int) [][][]byte
func (re *Regexp) FindAllSubmatchIndex(b []byte, n int) [][]int
func (re *Regexp) FindIndex(b []byte) (loc []int)
func (re *Regexp) FindReaderIndex(r io.RuneReader) (loc []int)
func (re *Regexp) FindReaderSubmatchIndex(r io.RuneReader) []int
func (re *Regexp) FindString(s string) string
func (re *Regexp) FindStringIndex(s string) (loc []int)
func (re *Regexp) FindStringSubmatch(s string) []string
func (re *Regexp) FindStringSubmatchIndex(s string) []int
func (re *Regexp) FindSubmatch(b []byte) [][]byte
func (re *Regexp) FindSubmatchIndex(b []byte) []int

其实好记，Find(All)?(String)?(Submatch)?(Index)? 一组合就有 16 种了，再加上两个 FindReader 方法。

Replace 系列

func (re *Regexp) ReplaceAll(src, repl []byte) []byte
func (re *Regexp) ReplaceAllFunc(src []byte, repl func([]byte) []byte) []byte
func (re *Regexp) ReplaceAllLiteral(src, repl []byte) []byte
func (re *Regexp) ReplaceAllLiteralString(src, repl string) string
func (re *Regexp) ReplaceAllString(src, repl string) string
func (re *Regexp) ReplaceAllStringFunc(src string, repl func(string) string) string

其他

func (re *Regexp) Copy() *Regexp // DEPRECATED
func (re *Regexp) Expand(dst []byte, template []byte, src []byte, match []int) []byte
func (re *Regexp) ExpandString(dst []byte, template string, src string, match []int) []byte
func (re *Regexp) LiteralPrefix() (prefix string, complete bool)
func (re *Regexp) Longest()
func (re *Regexp) NumSubexp() int
func (re *Regexp) Split(s string, n int) []string
func (re *Regexp) String() string
func (re *Regexp) SubexpIndex(name string) int
func (re *Regexp) SubexpNames() []string

四个封装方法

func Match(pattern string, b []byte) (matched bool, err error)
func MatchReader(pattern string, r io.RuneReader) (matched bool, err error)
func MatchString(pattern string, s string) (matched bool, err error)
func QuoteMeta(s string) string

示例

func main() {
    text := "Hello, 2021! The year 2020 was great, but 2021 will be even better."

    pattern := `\b\d{4}\b` // 匹配四个数字的单词

    regex, err := regexp.Compile(pattern)
    if err != nil {
        fmt.Println("Error compiling regex:", err)
        return
    }

    matches := regex.FindAllString(text, -1)
    for _, match := range matches {
        fmt.Println(match)
    }
}

Output:

2021
2020
2021