From a054446e2f45855df0ac39937084b7e810aba408 Mon Sep 17 00:00:00 2001
From: Brian Brazil <brian.brazil@gmail.com>
Date: Thu, 16 Apr 2015 20:50:52 +0100
Subject: [PATCH] Correct example, need to specify variables like in bash.

See http://golang.org/pkg/regexp/#Regexp.Expand
---
 README.md      |  2 +-
 mapper_test.go | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 33ea0f3..c8db563 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ An example mapping configuration:
     name="signup_events"
     provider="$2"
     outcome="$3"
-    job="$1_server"
+    job="${1}_server"
     
 This would transform these example StatsD metrics into Prometheus metrics as
 follows:
diff --git a/mapper_test.go b/mapper_test.go
index 68d02c6..8c7a0e2 100644
--- a/mapper_test.go
+++ b/mapper_test.go
@@ -60,6 +60,34 @@ func TestMetricMapper(t *testing.T) {
 				"foo.bar.baz": map[string]string{},
 			},
 		},
+		// Config with bad regex reference.
+		{
+			config: `
+				test.*
+				name="name"
+				label="$1_foo"
+			`,
+			mappings: map[string]map[string]string{
+				"test.a": map[string]string{
+					"name":  "name",
+					"label": "",
+				},
+			},
+		},
+		// Config with good regex reference.
+		{
+			config: `
+				test.*
+				name="name"
+				label="${1}_foo"
+			`,
+			mappings: map[string]map[string]string{
+				"test.a": map[string]string{
+					"name":  "name",
+					"label": "a_foo",
+				},
+			},
+		},
 		// Config with bad metric line.
 		{
 			config: `