add support for <DOT> refanging

refang.go

@@ -24,16 +24,19 @@ func Refang(input interface{}) (string, error) {
 		return "", errors.New("unknown type")
 	}
 
+	output = strings.ToLower(output)
+
 	re := regexp.MustCompile(`(?i)^(?:hxxp|nsfw|evil|meow)`)
 
 	output = re.ReplaceAllString(output, "http")
 
 	output = strings.Replace(output, "[.]", ".", -1)
 	output = strings.Replace(output, "(.)", ".", -1)
 	output = strings.Replace(output, "<.>", ".", -1)
-	output = strings.Replace(output, "(dot)", ".", -1)
-	output = strings.Replace(output, "[dot]", ".", -1)
-	output = strings.Replace(output, "<dot>", ".", -1)
+
+	dotRE := regexp.MustCompile(`(?i)[\[<(]dot[\]>)]`)
+	output = dotRE.ReplaceAllString(output, ".")
+
 	output = strings.Replace(output, "[//]", "//", -1)
 	output = strings.Replace(output, "<//>", "//", -1)
 

refang_test.go

@@ -26,6 +26,7 @@ func TestRefang(t *testing.T) {
 		{"dots word in angle brackets", args{"hxxps://google<dot>com"}, "https://google.com", false},
 		{"dots in angle brackets", args{"hxxps://google<.>com"}, "https://google.com", false},
 		{"slashes brackets", args{"hxxps:[//]google<.>com"}, "https://google.com", false},
+		{"url with <DOT>", args{"HXXPS://www.nist<DOT>gov/news-events/news/2019/11/nist-seeking-input-updates-nice-cybersecurity-workforce-framework"}, "https://www.nist.gov/news-events/news/2019/11/nist-seeking-input-updates-nice-cybersecurity-workforce-framework", false},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {