[go 标准库 regexp] go 标准库 regexp #go #标准库 #regexp

标准库regexp.md

正则语法

https://golang.org/pkg/regexp/syntax/

Match

func Match(pattern string, b []byte) (matched bool, err error)

package main

import (
	"fmt"
	"regexp"
)

func main() {
	matched, err := regexp.Match(`foo.*`, []byte(`seafood`))
	fmt.Println(matched, err)
	matched, err = regexp.Match(`bar.*`, []byte(`seafood`))
	fmt.Println(matched, err)
	matched, err = regexp.Match(`a(b`, []byte(`seafood`))
	fmt.Println(matched, err)

}

MatchString

func MatchString(pattern string, s string) (matched bool, err error)

package main

import (
	"fmt"
	"regexp"
)

func main() {
	matched, err := regexp.MatchString(`foo.*`, "seafood")
	fmt.Println(matched, err)
	matched, err = regexp.MatchString(`bar.*`, "seafood")
	fmt.Println(matched, err)
	matched, err = regexp.MatchString(`a(b`, "seafood")
	fmt.Println(matched, err)
}

Find

func (re *Regexp) Find(b []byte) []byte

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo.?`)
	fmt.Printf("%q\n", re.Find([]byte(`seafood fool`)))

}

FindAll

func (re *Regexp) FindAll(b []byte, n int) [][]byte

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo.?`)
	fmt.Printf("%q\n", re.FindAll([]byte(`seafood fool`), -1))

}

FindAllString

func (re *Regexp) FindAllString(s string, n int) []string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`a.`)
	fmt.Println(re.FindAllString("paranormal", -1))
	fmt.Println(re.FindAllString("paranormal", 2))
	fmt.Println(re.FindAllString("graal", -1))
	fmt.Println(re.FindAllString("none", -1))
}

FindAllStringSubmatch

func (re *Regexp) FindAllStringSubmatch(s string, n int) [][]string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`a(x*)b`)
	fmt.Printf("%q\n", re.FindAllStringSubmatch("-ab-", -1))
	fmt.Printf("%q\n", re.FindAllStringSubmatch("-axxb-", -1))
	fmt.Printf("%q\n", re.FindAllStringSubmatch("-ab-axb-", -1))
	fmt.Printf("%q\n", re.FindAllStringSubmatch("-axxb-ab-", -1))
}

FindAllSubmatch

func (re *Regexp) FindAllSubmatch(b []byte, n int) [][][]byte

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo(.?)`)
	fmt.Printf("%q\n", re.FindAllSubmatch([]byte(`seafood fool`), -1))

}

FindString

func (re *Regexp) FindString(s string) string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo.?`)
	fmt.Printf("%q\n", re.FindString("seafood fool"))
	fmt.Printf("%q\n", re.FindString("meat"))
}

FindStringIndex

func (re *Regexp) FindStringIndex(s string) (loc []int)

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`ab?`)
	fmt.Println(re.FindStringIndex("tablett"))
	fmt.Println(re.FindStringIndex("foo") == nil)
}

FindStringSubmatch

func (re *Regexp) FindStringSubmatch(s string) []string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`a(x*)b(y|z)c`)
	fmt.Printf("%q\n", re.FindStringSubmatch("-axxxbyc-"))
	fmt.Printf("%q\n", re.FindStringSubmatch("-abzc-"))
}

FindSubmatch

func (re *Regexp) FindSubmatch(b []byte) [][]byte

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo(.?)`)
	fmt.Printf("%q\n", re.FindSubmatch([]byte(`seafood fool`)))

}

Regexp.Match

func (re *Regexp) Match(b []byte) bool

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`foo.?`)
	fmt.Println(re.Match([]byte(`seafood fool`)))

}

Regexp.MatchString

func (re *Regexp) MatchString(s string) bool

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`(gopher){2}`)
	fmt.Println(re.MatchString("gopher"))
	fmt.Println(re.MatchString("gophergopher"))
	fmt.Println(re.MatchString("gophergophergopher"))
}

ReplaceAllString

func (re *Regexp) ReplaceAllString(src, repl string) string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`a(x*)b`)
	fmt.Println(re.ReplaceAllString("-ab-axxb-", "T"))
	fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1"))
	fmt.Println(re.ReplaceAllString("-ab-axxb-", "$1W"))
	fmt.Println(re.ReplaceAllString("-ab-axxb-", "${1}W"))
}

Split

func (re *Regexp) Split(s string, n int) []string

package main

import (
	"fmt"
	"regexp"
)

func main() {
	a := regexp.MustCompile(`a`)
	fmt.Println(a.Split("banana", -1))
	fmt.Println(a.Split("banana", 0))
	fmt.Println(a.Split("banana", 1))
	fmt.Println(a.Split("banana", 2))
	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))
}