Question

 <a href="$handler$&landing_url=https://foo.com/index.html">
  <img src="https://foo.com/images/08_180x80.gif" border="0" alt="">
</a>

I have this code which I need to return to calling service. However, while returning, i need to replace $handler$ with something i get from props file. Which is easy.

hard part is :

I need to get the landing_url , encrypt it, also add more info to it.

How can i parse this fragment into pieces ?

or is there an easier way to do it?

Answer 1

This is the regex you need: /<a href=\".*?landing_url=(.*?)\">/.

Putting all the code together:

public static void main(String[] args) {
    String str = "<a href=\"$handler$&landing_url=https://foo.com/index.html\">";
    String regex = "<a href=\".*?landing_url=(.*?)\">";
    List<String> parts = evaluate(regex, str);
    System.out.println("landing_url: " + parts.get(0));
}

public static List<String> evaluate(String regex, String line) {
    List<String> result = new ArrayList<String>();
    Pattern pattern = Pattern.compile(regex);

    int count = 1;
    Matcher matcher = pattern.matcher(line);
    while (matcher.find()) {
        result.add(matcher.group(count++));
    }
    return result;
}