irc regex example

irc.go

package main

import (
	"fmt"
	"regexp"
)

// Valid Go regexp: https://code.google.com/p/re2/wiki/Syntax

var fixtures []string = []string{
	"PING :irc.freenode.net",                              // Server PING
	":[email protected] PRIVMSG #PugBotTest :Hello, World!", // Message to channel
	":[email protected] PRIVMSG PugBot :Hello, There!",      // Message to bot
}

func main() {
	// Compile the regexp string and get an instance of `Regexp` back
	r, err := regexp.Compile(`^(?:[:](\S+) )?(\S+)(?: ([^:].+?))?(?: [:](.+))?$`)
	if err != nil {
		panic(err)
	}

	// Loop thru each of our tests
	for _, v := range fixtures {
		// Doesn't match, we suck
		if r.MatchString(v) == false {
			fmt.Println("Well, we fucked up!")
			return
		}

		matches := r.FindAllStringSubmatch(v, -1)
		if len(matches) == 0 {
			fmt.Println("Well, we fucked up!")
			return
		}

		for _, match := range matches {
			for idx, value := range match {
				fmt.Printf("%d: %s\n", idx, value)
			}
			fmt.Println()
		}
	}
}