Merge pull request #3274 from prometheus/matcher-anchoring

Don't add anchoring to exported `Value` matcher field

pkg/labels/matcher.go

@@ -59,8 +59,7 @@ func NewMatcher(t MatchType, n, v string) (*Matcher, error) {
 		Value: v,
 	}
 	if t == MatchRegexp || t == MatchNotRegexp {
-		m.Value = "^(?:" + v + ")$"
-		re, err := regexp.Compile(m.Value)
+		re, err := regexp.Compile("^(?:" + v + ")$")
 		if err != nil {
 			return nil, err
 		}

pkg/labels/matcher_test.go

@@ -0,0 +1,89 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package labels
+
+import "testing"
+
+func mustNewMatcher(t *testing.T, mType MatchType, value string) *Matcher {
+	m, err := NewMatcher(mType, "", value)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return m
+}
+
+func TestMatcher(t *testing.T) {
+	tests := []struct {
+		matcher *Matcher
+		value   string
+		match   bool
+	}{
+		{
+			matcher: mustNewMatcher(t, MatchEqual, "bar"),
+			value:   "bar",
+			match:   true,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchEqual, "bar"),
+			value:   "foo-bar",
+			match:   false,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchNotEqual, "bar"),
+			value:   "bar",
+			match:   false,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchNotEqual, "bar"),
+			value:   "foo-bar",
+			match:   true,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchRegexp, "bar"),
+			value:   "bar",
+			match:   true,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchRegexp, "bar"),
+			value:   "foo-bar",
+			match:   false,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchRegexp, ".*bar"),
+			value:   "foo-bar",
+			match:   true,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchNotRegexp, "bar"),
+			value:   "bar",
+			match:   false,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchNotRegexp, "bar"),
+			value:   "foo-bar",
+			match:   true,
+		},
+		{
+			matcher: mustNewMatcher(t, MatchNotRegexp, ".*bar"),
+			value:   "foo-bar",
+			match:   false,
+		},
+	}
+
+	for _, test := range tests {
+		if test.matcher.Matches(test.value) != test.match {
+			t.Fatalf("Unexpected match result for matcher %v and value %q; want %v, got %v", test.matcher, test.value, test.match, !test.match)
+		}
+	}
+}

storage/tsdb/tsdb.go

@@ -233,14 +233,14 @@ func convertMatcher(m *labels.Matcher) tsdbLabels.Matcher {
 		return tsdbLabels.Not(tsdbLabels.NewEqualMatcher(m.Name, m.Value))
 
 	case labels.MatchRegexp:
-		res, err := tsdbLabels.NewRegexpMatcher(m.Name, m.Value)
+		res, err := tsdbLabels.NewRegexpMatcher(m.Name, "^(?:"+m.Value+")$")
 		if err != nil {
 			panic(err)
 		}
 		return res
 
 	case labels.MatchNotRegexp:
-		res, err := tsdbLabels.NewRegexpMatcher(m.Name, m.Value)
+		res, err := tsdbLabels.NewRegexpMatcher(m.Name, "^(?:"+m.Value+")$")
 		if err != nil {
 			panic(err)
 		}