Simple Java thread dump parser

parser.go

package main

import (
	"bufio"
	"context"
	"flag"
	"fmt"
	"os"
	"os/signal"
	"regexp"
)

func main() {
	filter := flag.String("filter", ".*", "Filter threads")
	flag.Parse()

	fmt.Println("Using filter:", *filter)

	// Set up the signal handler to deal with user interrupts
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	sigs := make(chan os.Signal, 1)
	signal.Notify(sigs, os.Interrupt)

	// Set up the scanning of the STDIN
	s := make(chan string, 1)
	scanner := bufio.NewScanner(os.Stdin)

	go func(s chan string) {
		for scanner.Scan() {
			s <- scanner.Text()
		}
	}(s)

	// Regexes for parsing pertinent parts of the data stream
	reFilter := regexp.MustCompile(*filter)
	reThread := regexp.MustCompile(`"([^"]+)".* nid=\S+ ([^[]+)`)

	for {
		select {
		case text := <-s:
			if matches := reThread.FindStringSubmatch(text); len(matches) > 0 {
				// Simply for now just output
				if reFilter.MatchString(text) {
					fmt.Printf("%-25s %s\n", matches[1], matches[2])
				}
			}
		case <-ctx.Done():
			return
		case <-sigs:
			// TODO
			fmt.Println("Cleaning up and exiting!")
			os.Exit(0)
		}
	}

}