Split code into smaller parts within the auth package

auth/regexp-utils.go

@@ -0,0 +1,19 @@
+package auth
+
+import "regexp"
+
+type regexpSubmatcher struct {
+	re *regexp.Regexp
+}
+
+func (resm *regexpSubmatcher) getSubmatches(target string) map[string]string {
+	matches := resm.re.FindStringSubmatch(target)
+	l := len(matches)
+	submatches := make(map[string]string, l)
+	for i, name := range resm.re.SubexpNames() {
+		if i > 0 && i <= l {
+			submatches[name] = matches[i]
+		}
+	}
+	return submatches
+}