[TOC] ## 语法 ``` type Regexp func Compile(expr string) (*Regexp, error) func CompilePOSIX(expr string) (*Regexp, error) // MustCompile类似Compile但会在解析失败时panic func MustCompile(str string) *Regexp func MustCompilePOSIX(str string) *Regexp func (re *Regexp) String() string func (re *Regexp) LiteralPrefix() (prefix string, complete bool) func (re *Regexp) Longest() func (re *Regexp) NumSubexp() int func (re *Regexp) SubexpNames() []string func (re *Regexp) Match(b []byte) bool func (re *Regexp) MatchString(s string) bool func (re *Regexp) MatchReader(r io.RuneReader) bool func (re *Regexp) Find(b []byte) []byte func (re *Regexp) FindString(s string) string func (re *Regexp) FindIndex(b []byte) (loc []int) func (re *Regexp) FindStringIndex(s string) (loc []int) func (re *Regexp) FindReaderIndex(r io.RuneReader) (loc []int) func (re *Regexp) FindSubmatch(b []byte) [][]byte func (re *Regexp) FindStringSubmatch(s string) []string func (re *Regexp) FindSubmatchIndex(b []byte) []int func (re *Regexp) FindStringSubmatchIndex(s string) []int func (re *Regexp) FindReaderSubmatchIndex(r io.RuneReader) []int func (re *Regexp) FindAll(b []byte, n int) [][]byte func (re *Regexp) FindAllString(s string, n int) []string func (re *Regexp) FindAllIndex(b []byte, n int) [][]int func (re *Regexp) FindAllStringIndex(s string, n int) [][]int func (re *Regexp) FindAllSubmatch(b []byte, n int) [][][]byte func (re *Regexp) FindAllStringSubmatch(s string, n int) [][]string func (re *Regexp) FindAllSubmatchIndex(b []byte, n int) [][]int func (re *Regexp) FindAllStringSubmatchIndex(s string, n int) [][]int func (re *Regexp) Split(s string, n int) []string 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) ReplaceAllLiteral(src, repl []byte) []byte func (re *Regexp) ReplaceAllLiteralString(src, repl string) string func (re *Regexp) ReplaceAll(src, repl []byte) []byte func (re *Regexp) ReplaceAllString(src, repl string) string func (re *Regexp) ReplaceAllFunc(src []byte, repl func([]byte) []byte) []byte func (re *Regexp) ReplaceAllStringFunc(src string, repl func(string) string) string ``` ## 实例 ### 判断正则是否符合要求 方法一: ``` bool, err := regexp.MatchString("p([a-z]+)ch", "peach") ``` 方法二: ``` r, _ := regexp.Compile("p([a-z]+)ch") bool:=r.MatchString("peach") ``` ### Find / FindAll ``` re := regexp.MustCompile(`foo.?`) fmt.Printf("%q\n", re.FindStringSubmatch(`seafood fool`)) // ["food"] re1 := regexp.MustCompile(`foo.?`) fmt.Printf("%q\n", re1.FindAllString(`seafood fool`, -1)) // ["food" "fool"] ``` ### FindSubmatch / FindAllSubmatch 获取子查询 ``` re := regexp.MustCompile(`foo(.?)`) fmt.Printf("%q\n", re.FindSubmatch([]byte(`seafood fool`))) // ["food" "d"] re1 := regexp.MustCompile(`foo(.?)`) fmt.Printf("%q\n", re1.FindAllSubmatch([]byte(`seafood fool`), -1)) // [["food" "d"] ["fool" "l"]] ``` ### Index ``` re := regexp.MustCompile(`ab?`) fmt.Println(re.FindStringIndex("tablett")) // [1 3] fmt.Println(re.FindStringIndex("foo") == nil) // true fmt.Println(re.FindAllStringIndex("tablettab1", -1)) // [[1 3] [7 9]] fmt.Println(re.FindAllStringIndex("foo", -1) == nil) // true ``` ### Replace ``` re := regexp.MustCompile(`a(bc)`) fmt.Printf("%+v\n", re.ReplaceAllString("abcdefabcdef", "=${1}=")) // =bc=def=bc=def fmt.Printf("%+v\n", re.ReplaceAllLiteralString("abcdefabcdef", "=${1}=")) // =${1}=def=${1}=def fmt.Printf("%+v\n", re.ReplaceAllStringFunc("abcdefabcdef", func(s string) string { //s -> abc return "=" + s + "=" })) // =abc=def=abc=def ``` ### Split ``` zp := regexp.MustCompile(`z+`) fmt.Println(zp.Split("pizza", -1)) fmt.Println(zp.Split("pizza", 0)) fmt.Println(zp.Split("pizza", 1)) fmt.Println(zp.Split("pizza", 2)) // Output: // [pi a] // [] // [pizza] // [pi a] ```