Regular Expressions in Go
Go offers built-in support for regular expressions. Here are some examples of common regexp-related tasks in Go.
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(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))
}