diff --git a/build/builder.go b/build/builder.go
index dfbfcf7fa..4f8824e1f 100644
--- a/build/builder.go
+++ b/build/builder.go
@@ -37,7 +37,7 @@ import (
 	"time"
 
 	"github.com/bmatcuk/doublestar"
-	"github.com/grafana/regexp"
+	"github.com/go-enry/go-enry/v2"
 	"github.com/rs/xid"
 
 	"github.com/sourcegraph/zoekt"
@@ -901,18 +901,8 @@ func squashRange(j int) float64 {
 //
 // These 'priority' criteria affects how documents are ordered within a shard. It's
 // also used to help guess a file's rank when we're missing ranking information.
-func IsLowPriority(file string) bool {
-	return testRe.MatchString(file) || isGenerated(file) || isVendored(file)
-}
-
-var testRe = regexp.MustCompile("[Tt]est")
-
-func isGenerated(file string) bool {
-	return strings.HasSuffix(file, "min.js") || strings.HasSuffix(file, "js.map")
-}
-
-func isVendored(file string) bool {
-	return strings.Contains(file, "vendor/") || strings.Contains(file, "node_modules/")
+func IsLowPriority(path string, content []byte) bool {
+	return enry.IsTest(path) || enry.IsVendor(path) || enry.IsGenerated(path, content)
 }
 
 type rankedDoc struct {
@@ -931,17 +921,17 @@ func rank(d *zoekt.Document, origIdx int) []float64 {
 	}
 
 	generated := 0.0
-	if isGenerated(d.Name) {
+	if enry.IsGenerated(d.Name, d.Content) {
 		generated = 1.0
 	}
 
 	vendor := 0.0
-	if isVendored(d.Name) {
+	if enry.IsVendor(d.Name) {
 		vendor = 1.0
 	}
 
 	test := 0.0
-	if testRe.MatchString(d.Name) {
+	if enry.IsTest(d.Name) {
 		test = 1.0
 	}
 
diff --git a/build/builder_test.go b/build/builder_test.go
index e5f4742df..ecf5c82f8 100644
--- a/build/builder_test.go
+++ b/build/builder_test.go
@@ -764,8 +764,7 @@ func TestFindRepositoryMetadata(t *testing.T) {
 func TestIsLowPriority(t *testing.T) {
 	cases := []string{
 		"builder_test.go",
-		"TestQuery.java",
-		"test/mocks.go",
+		"test/TestQuery.java",
 		"search/vendor/thirdparty.cc",
 		"search/node_modules/search/index.js",
 		"search.min.js",
@@ -774,7 +773,7 @@ func TestIsLowPriority(t *testing.T) {
 
 	for _, tt := range cases {
 		t.Run(tt, func(t *testing.T) {
-			if !IsLowPriority(tt) {
+			if !IsLowPriority(tt, nil) {
 				t.Errorf("expected file '%s' to be low priority", tt)
 			}
 		})
@@ -788,7 +787,7 @@ func TestIsLowPriority(t *testing.T) {
 
 	for _, tt := range negativeCases {
 		t.Run(tt, func(t *testing.T) {
-			if IsLowPriority(tt) {
+			if IsLowPriority(tt, nil) {
 				t.Errorf("did not expect file '%s' to be low priority", tt)
 			}
 		})
diff --git a/build/e2e_test.go b/build/e2e_test.go
index f66b64b9e..1eb5acff4 100644
--- a/build/e2e_test.go
+++ b/build/e2e_test.go
@@ -502,7 +502,7 @@ func TestFileRank(t *testing.T) {
 		name: "test",
 		docs: []*zoekt.Document{
 			{
-				Name:    "test",
+				Name:    "foo_test.go",
 				Content: []byte("bla"),
 			},
 			{
diff --git a/gitindex/index.go b/gitindex/index.go
index 92cf3686c..ddf73e0d6 100644
--- a/gitindex/index.go
+++ b/gitindex/index.go
@@ -589,10 +589,10 @@ type repoPathRanks struct {
 //   - If we have a concrete rank for this file, always use it
 //   - If there's no rank, and it's a low priority file like a test, then use rank 0
 //   - Otherwise use the mean rank of this repository, to avoid giving it a big disadvantage
-func (r repoPathRanks) rank(path string) float64 {
+func (r repoPathRanks) rank(path string, content []byte) float64 {
 	if rank, ok := r.Paths[path]; ok {
 		return rank
-	} else if build.IsLowPriority(path) {
+	} else if build.IsLowPriority(path, content) {
 		return 0.0
 	} else {
 		return r.MeanRank
@@ -910,7 +910,7 @@ func createDocument(key fileKey,
 	var pathRanks []float64
 	if len(ranks.Paths) > 0 {
 		// If the repository has ranking data, then store the file's rank.
-		pathRank := ranks.rank(keyFullPath)
+		pathRank := ranks.rank(keyFullPath, contents)
 		pathRanks = []float64{pathRank}
 	}
 
diff --git a/gitindex/index_test.go b/gitindex/index_test.go
index 63f5899a7..0aca04145 100644
--- a/gitindex/index_test.go
+++ b/gitindex/index_test.go
@@ -744,7 +744,7 @@ func TestRepoPathRanks(t *testing.T) {
 
 	for _, tt := range cases {
 		t.Run(tt.name, func(t *testing.T) {
-			got := pathRanks.rank(tt.path)
+			got := pathRanks.rank(tt.path, nil)
 			if got != tt.rank {
 				t.Errorf("expected file '%s' to have rank %f, but got %f", tt.path, tt.rank, got)
 			}