47-regular-expressions.go

package main

import (
	"fmt"
	"bytes"
	"regexp"
)

func main() {
	match, _ := regexp.MatchString("p([a-z]+)ch", "peach")
	fmt.Println(match)

	r, _ := regexp.Compile("p([a-z]+)ch")

	fmt.Println(r.MatchString("peach"))
	fmt.Println(r.FindString("peach punch"))
	fmt.Println(r.FindStringIndex("peach punch"))

	fmt.Println(r.FindStringSubmatch("peach punch"))
    fmt.Println(r.FindStringSubmatchIndex("peach punch"))
    fmt.Println(r.FindAllString("peach punch pinch", -1))

    fmt.Println(r.FindAllStringSubmatchIndex("peach punch pinch", -1))
    fmt.Println(r.FindAllString("peach punch pinch", 2))
	fmt.Println(r.Match([]byte("peach")))

	r = regexp.MustCompile("p([a-z]+)ch")
	fmt.Println(r)

    fmt.Println(r.ReplaceAllString("a peach", "<fruit>"))

    in := []byte("a peach")
    out := r.ReplaceAllFunc(in, bytes.ToUpper)
    fmt.Println(string(out))
}