go regexp for a whirl

go_reg

package main
import (
    "regexp"
    "fmt"

)
var reg string = `^(?P<RemoteIP>\S+) \S+ \S+ \[(?P<Timestamp>[^\]]+)\] "(?P<Method>[A-Z]+) (?P<Url>[^\s]+)[^"]*" (?P<StatusCode>\d+) (?P<RequestSize>\d+)`
var line string = "65.32.144.5 - - [07/Mar/2014:15:36:34 +0400] \"POST /api/listAddresses HTTP/1.1\" 200 290"

func main() {
    m, err := regexp.Compile(reg)
    if err != nil { panic(err); }
    res := m.FindStringSubmatch(line)
    if res == nil {
        panic(fmt.Errorf("no match "))
    }
    for index, name := range m.SubexpNames() {
        if index == 0 {
            continue
        } 
        if name == "" { 
            name = fmt.Sprintf("%d", index)
        }
        fmt.Printf("%v %v\n", name, res[index])

    }