Simple program to test go regular expressions.

trex.go

// Simple program to test go regular expressions.
//
// You specify a regular expression followed by a list of
// strings to test against it. The program reports whether
// each string matched.
//
// Here is how you build it:
//
//   $ go build trex.go
//
// Here is how you use it:
//
//    $ go build trex.go
//    $ ./trex '\bmain\b' 'foomain' 'foo.main' 'foo.main.bar' 'mainx'
//    '\bmain\b'  NO-MATCH  'foomain'
//    '\bmain\b'  MATCH     'foo.main'
//    '\bmain\b'  MATCH     'foo.main.bar'
//    '\bmain\b'  NO-MATCH  'mainx'
//
package main

import (
	"fmt"
	"log"
	"os"
	"regexp"
)

func main() {
	// Make sure that we have the minimum.
	if len(os.Args) < 3 {
		log.Fatalf("ERROR: Not enough arguments.\n\tYou need to specify a regexp and at least one test.\n")
	}

	// Compile the regular expressions.
	re, err := regexp.Compile(os.Args[1])
	if err != nil {
		log.Fatalf("ERROR: invalid regexp: %v\n", err)
	}

	// Test the other arguments to see if the match or not.
	for i := 2; i < len(os.Args) ; i++ {
		arg := os.Args[i]
		if re.MatchString(arg) {
			fmt.Printf("'%s'  MATCH    '%s'\n", re, arg)
		} else {
			fmt.Printf("'%s'  NOMATCH  '%s'\n", re, arg)
		}
	}
}