Golang map of a regular experssions capture groups

match_groups.go

package main

import (
	"fmt"
	"regexp"
)

func capturingGroups(re *regexp.Regexp, input string) map[string]string {
	groups := make(map[string]string)
	matches := re.FindStringSubmatch(input)
	for idx, name := range re.SubexpNames() {
		groups[name] = matches[idx]
	}
	return groups
}

func main() {
	exampleRE := regexp.MustCompile(`My name is (?P<firstname>\w+)\s(?P<lastname>\w+)`)
	groups := capturingGroups(exampleRE, "My name is John Doe.")
	fmt.Println(groups["lastname"], groups["firstname"])
}

https://play.golang.org/p/5SBBQRVuTWj