regexp_group.go

package main

import (
	"fmt"
	"regexp"
)

func main() {
	e := `^(?P<length>\d+)(?P<unit>[dmy])$`
	r := regexp.MustCompile(e)
	names := r.SubexpNames()
	tests := []string{
		`1234d`,
		`2y`,
		`234m`,
		`1234`,
		`mmmm`}
	for _, t := range tests {
		fmt.Printf("testing: %q\r\n", t)

		result := r.FindAllStringSubmatch(t, -1)
		matched := r.MatchString(t)
		fmt.Println("matched:", matched)

		if result != nil {
			m := map[string]string{}
			for i, n := range result[0] {
				m[names[i]] = n
			}

			fmt.Printf("<length>: %q\r\n", m["length"])
			fmt.Printf("<unit>: %q\r\n", m["unit"])
		}

		fmt.Println()
	}
}