Tweak url validation pattern

web/utils/urls.ts

@@ -1,10 +1,4 @@
-// Stolen from https://stackoverflow.com/a/5717133
 export function isValidUrl(url: string): boolean {
-    var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
+  const pattern =  /^(?:(?: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*)?$/;
-    '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
-    '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
-    '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
-    '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
-    '(\\#[-a-z\\d_]*)?$','i'); // fragment locator
   return !!pattern.test(url);
 }