Fix

expand_test.go

@@ -469,7 +469,7 @@ func TestReplaceYAMLWithExprRepFn(t *testing.T) {
 		{
 			map[string]any{
 				"hello": map[string]any{
-					"foo": "ba\nr",
+					"foo": "bar",
 				},
 			},
 			false,
@@ -488,6 +488,39 @@ func TestReplaceYAMLWithExprRepFn(t *testing.T) {
 			`v: '\{\{ {{ hello }} \}\}'`,
 			`v: '{{ {"foo":"bar"} }}'`,
 		},
+		{
+			map[string]any{
+				"hello": map[string]any{
+					"foo": "bar",
+				},
+			},
+			false,
+			true,
+			`v: '\\{\{ hello \\}\}'`,
+			`v: '\{\{ hello \}\}'`,
+		},
+		{
+			map[string]any{
+				"hello": map[string]any{
+					"foo": "bar",
+				},
+			},
+			false,
+			true,
+			`v: '\\\{\{ hello \\\}\}'`,
+			`v: '\\{\{ hello \\}\}'`,
+		},
+		{
+			map[string]any{
+				"hello": map[string]any{
+					"foo": "bar",
+				},
+			},
+			false,
+			true,
+			`v: '\\{\\{ hello \\}\\}'`,
+			`v: '\\{\\{ hello \\}\\}'`,
+		},
 	}
 	for i, tt := range tests {
 		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {

repfn.go

@@ -137,16 +137,23 @@ func trySubstr(delimStart, delimEnd, in string) ([]string, int) {
 }
 
 func unescapeDelims(delimStart, delimEnd, in string) string {
+	const (
+		eeStartToken = "__E_E_DELIM_START__"
+		eeEndToken   = "__E_E_DELIM_END__"
+	)
 	var (
 		escapedDelimStart string
 		escapedDelimEnd   string
 	)
 	for _, r := range delimStart {
 		escapedDelimStart += fmt.Sprintf("\\%s", string(r))
 	}
+	escapedescapedDelimStart := fmt.Sprintf("\\%s", escapedDelimStart)
 	for _, r := range delimEnd {
 		escapedDelimEnd += fmt.Sprintf("\\%s", string(r))
 	}
-	rep := strings.NewReplacer(escapedDelimStart, delimStart, escapedDelimEnd, delimEnd)
-	return rep.Replace(in)
+	escapedescapedDelimEnd := fmt.Sprintf("\\%s", escapedDelimEnd)
+	rep := strings.NewReplacer(escapedescapedDelimStart, eeStartToken, escapedescapedDelimEnd, eeEndToken, escapedDelimStart, delimStart, escapedDelimEnd, delimEnd)
+	rep2 := strings.NewReplacer(eeStartToken, escapedDelimStart, eeEndToken, escapedDelimEnd)
+	return rep2.Replace(rep.Replace(in))
 }