package main
import (
"bytes"
"fmt"
"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("idx:", 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("all:", 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("regexp:", r)
fmt.Println(r.ReplaceAllString("a peach", ""))
in := []byte("a peach")
out := r.ReplaceAllFunc(in, bytes.ToUpper)
fmt.Println(string(out))
} $ go run regular-expressions.go
true
true
peach
idx: [0 5]
[peach ea]
[0 5 1 3]
[peach punch pinch]
all: [[0 5 1 3] [6 11 7 9] [12 17 13 15]]
[peach punch]
true
regexp: p([a-z]+)ch
a
a PEACH