Bugfix/version dirty tag fix (#38)

* Version dirty check fix

* Changed dirty tag index

core/semver/semver.go

@@ -103,7 +103,7 @@ func main() {
 
 	gitdesc := chkErr(doExec("git", "describe", "--long", "--dirty"))
 	rx := regexp.MustCompile(
-		`^[^\d]*(\d+)\.(\d+)\.(\d+)\-?(?:(-?[a-zA-Z]+))?(?:-(\d+)-g(.+?)(?:-(dirty))?)?\s*$`)
+		`^[^\d]*(\d+)\.(\d+)\.(\d+)(?:-([a-zA-Z].+?))?(?:-(\d+)-g(.+?)(?:-(dirty))?)?\s*$`)
 	m := rx.FindStringSubmatch(gitdesc)
 	if len(m) == 0 {
 		fmt.Fprintf(os.Stderr, "error: match git describe failed: %s\n", gitdesc)
@@ -128,9 +128,9 @@ func main() {
 		Minor:  toInt(m[2]),
 		Patch:  toInt(m[3]),
 		Notes:  m[4],
-		Sha7:   m[5],
+		Sha7:   m[6],
 		Sha32:  chkErr(doExec("git", "log", "-n1", `--format=%H`)),
-		Dirty:  m[6] != "",
+		Dirty:  m[7] != "",
 		Epoch:  toInt64(chkErr(doExec("git", "log", "-n1", `--format=%ct`))),
 	}
 	ver.SemVer = ver.String()