URL regex passed by regex buddy but failed by Dart

Question

I have the following regex in JavaScript regex

(https?|ftp)://([-A-Z0-9.]+)(/[-A-Z0-9+&@#/%=~_|!:,.;]*)?(\\?[A-Z0         


        

Answer 1

Your pattern doesn't look for lowercase characters. Either you add a-z to the respective character groups or you use caseSenstivie: false as shown in the code.

var urlPattern = r"(https?|ftp)://([-A-Z0-9.]+)(/[-A-Z0-9+&@#/%=~_|!:,.;]*)?(\?[A-Z0-9+&@#/%=~_|!:‌​,.;]*)?";
var result = new RegExp(urlPattern, caseSensitive: false).firstMatch('https://www.google.com');

If the result is != null a match was found.

Your pattern doesn't find http: URLs (only https or ftp) neither www.google.com. Your statement about 'empty space' might apply to your email regexp you had in your question originally but not to your URL regexp you added in your comment.