diff --git a/src/utils/Util.ts b/src/utils/Util.ts
index 2c6e6ec..556e129 100644
--- a/src/utils/Util.ts
+++ b/src/utils/Util.ts
@@ -12,6 +12,7 @@ const spotifyAlbumRegex = /https?:\/\/(?:embed\.|open\.)(?:spotify\.com\/)(?:alb
 const vimeoRegex = /(http|https)?:\/\/(www\.|player\.)?vimeo\.com\/(?:channels\/(?:\w+\/)?|groups\/([^/]*)\/videos\/|video\/|)(\d+)(?:|\/\?)/;
 const facebookRegex = /(https?:\/\/)(www\.|m\.)?(facebook|fb).com\/.*\/videos\/.*/;
 const reverbnationRegex = /https:\/\/(www.)?reverbnation.com\/(.+)\/song\/(.+)/;
+const attachmentRegex = /^(?:(?:https?|ftp):\/\/)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:\/\S*)?$/;
 
 export class Util {
     constructor() {
@@ -66,10 +67,7 @@ export class Util {
     }
 
     static isURL(str: string) {
-        const urlRegex =
-            '^(?!mailto:)(?:(?:http|https|ftp)://)(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[0-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))|localhost)(?::\\d{2,5})?(?:(/|\\?|#)[^\\s]*)?$';
-        const url = new RegExp(urlRegex, 'i');
-        return str.length < 2083 && url.test(str);
+        return str.length < 2083 && attachmentRegex.test(str);
     }
 
     static getVimeoID(query: string) {