public static void findURLs(File file) {
        try {
            BufferedReader br = new BufferedReader(new FileReader(file));
            String line = "";
            Pattern pattern = Pattern.compile("(?i)href=\".+\"");

            while ((line = br.readLine()) != null) {
                Matcher m = pattern.matcher(line);
                while (m.find()) {
                    String[] urls = m.group().split("(?i)\\s+");
                    for (String s : urls) {
                        if (s.matches("(?i)href=\".+\"")) {
                            String[] cleaned = s.split("(?i)href=");
                            for (String str : cleaned) {
                                if (!str.isEmpty())
                                    System.out.println(str.substring(1, str.length()-1));
                            }
                        }
                    }
                }
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }