diff --git a/bpmodify/bpmodify.go b/bpmodify/bpmodify.go
index 42de70e..ec24d5f 100644
--- a/bpmodify/bpmodify.go
+++ b/bpmodify/bpmodify.go
@@ -46,7 +46,7 @@ func init() {
 	flag.Var(stringPtrFlag{&addLiteral}, "add-literal", "a literal to add")
 	flag.Var(removeIdents, "r", "comma or whitespace separated list of identifiers to remove")
 	flag.Var(stringPtrFlag{&setString}, "str", "set a string property")
-	flag.Var(replaceProperty, "replace-property", "property names to be replaced, in the form of oldName1:newName1,oldName2:newName2")
+	flag.Var(replaceProperty, "replace-property", "property names to be replaced, in the form of oldName1=newName1,oldName2=newName2")
 	flag.Usage = usage
 }
 
@@ -301,7 +301,8 @@ func targetedModule(name string) bool {
 	return false
 }
 func visitFile(path string, f os.FileInfo, err error) error {
-	if err == nil && f.Name() == "Blueprints" {
+	//TODO(dacek): figure out a better way to target intended .bp files without parsing errors
+	if err == nil && (f.Name() == "Blueprints" || strings.HasSuffix(f.Name(), ".bp")) {
 		err = processFile(path, nil, os.Stdout)
 	}
 	if err != nil {
@@ -374,6 +375,7 @@ func main() {
 		}
 	}
 }
+
 func diff(b1, b2 []byte) (data []byte, err error) {
 	f1, err := ioutil.TempFile("", "bpfmt")
 	if err != nil {
@@ -438,7 +440,7 @@ func (m *replacements) Set(s string) error {
 	m.oldNameToNewName = make(map[string]string)
 	for i := 0; i < length; i++ {
 
-		pair := strings.SplitN(pairs[i], ":", 2)
+		pair := strings.SplitN(pairs[i], "=", 2)
 		if len(pair) != 2 {
 			return fmt.Errorf("Invalid replacement pair %s", pairs[i])
 		}
diff --git a/bpmodify/bpmodify_test.go b/bpmodify/bpmodify_test.go
index 4f37251..c3f7a21 100644
--- a/bpmodify/bpmodify_test.go
+++ b/bpmodify/bpmodify_test.go
@@ -373,7 +373,7 @@ var testCases = []struct {
 				],
 			}
 		`,
-		replaceProperty: "baz:baz_lib,foobar:foobar_lib",
+		replaceProperty: "baz=baz_lib,foobar=foobar_lib",
 	}, {
 		name:     "replace property multiple modules",
 		property: "deps,required",
@@ -396,7 +396,7 @@ var testCases = []struct {
 				required: ["foobar_lib"],
 			}
 		`,
-		replaceProperty: "baz:baz_lib,foobar:foobar_lib",
+		replaceProperty: "baz=baz_lib,foobar=foobar_lib",
 	}, {
 		name:     "replace property string value",
 		property: "name",
@@ -416,7 +416,7 @@ var testCases = []struct {
 				required: ["foobar"],
 			}
 		`,
-		replaceProperty: "foo:foo_lib",
+		replaceProperty: "foo=foo_lib",
 	}, {
 		name:     "replace property string and list values",
 		property: "name,deps",
@@ -436,7 +436,7 @@ var testCases = []struct {
 				required: ["foobar"],
 			}
 		`,
-		replaceProperty: "foo:foo_lib,baz:baz_lib",
+		replaceProperty: "foo=foo_lib,baz=baz_lib",
 	}, {
 		name: "move contents of property into non-existing property",
 		input: `
@@ -476,6 +476,26 @@ var testCases = []struct {
 		property:     "bar",
 		moveProperty: true,
 		newLocation:  "baz",
+	}, {
+		name: "replace nested",
+		input: `
+		cc_foo {
+			name: "foo",
+			foo: {
+				bar: "baz",
+			},
+		}
+	`,
+		output: `
+		cc_foo {
+			name: "foo",
+			foo: {
+				bar: "baz2",
+			},
+		}
+	`,
+		property:        "foo.bar",
+		replaceProperty: "baz=baz2",
 	},
 }
 
@@ -536,7 +556,7 @@ func TestProcessModule(t *testing.T) {
 }
 
 func TestReplacementsCycleError(t *testing.T) {
-	cycleString := "old1:new1,new1:old1"
+	cycleString := "old1=new1,new1=old1"
 	err := replaceProperty.Set(cycleString)
 
 	if err.Error() != "Duplicated replacement name new1" {
@@ -550,7 +570,7 @@ func TestReplacementsCycleError(t *testing.T) {
 }
 
 func TestReplacementsDuplicatedError(t *testing.T) {
-	cycleString := "a:b,a:c"
+	cycleString := "a=b,a=c"
 	err := replaceProperty.Set(cycleString)
 
 	if err.Error() != "Duplicated replacement name a" {
@@ -564,7 +584,7 @@ func TestReplacementsDuplicatedError(t *testing.T) {
 }
 
 func TestReplacementsMultipleReplacedToSame(t *testing.T) {
-	cycleString := "a:c,d:c"
+	cycleString := "a=c,d=c"
 	err := replaceProperty.Set(cycleString)
 
 	if err.Error() != "Duplicated replacement name c" {