I have URLs which always end on a number, for example:
String url = "localhost:8080/myproject/reader/add/1/";
String anotherurl = "localhost:8080/myproject/actor/take/154/";
I want to extract the number between the last two slashes ("/").
Does anyone know how I can do this?
You could split the string:
String[] items = url.split("/");
String number = items[items.length-1]; //last item before the last slash
With a regular expression:
final Matcher m = Pattern.compile("/([^/]+)/$").matcher(url);
if (m.find()) System.out.println(m.group(1));
Use lastIndexOf, like this:
String url = "localhost:8080/myproject/actor/take/154/";
int start = url.lastIndexOf('/', url.length()-2);
if (start != -1) {
String s = url.substring(start+1, url.length()-1);
int n = Integer.parseInt(s);
System.out.println(n);
}
That's the basic idea. You'll have to do some error checking (for example, if a number is not found at the end of the URL), but it will work fine.
For the inputs which you specified
String url = "localhost:8080/myproject/reader/add/1/";
String anotherurl = "localhost:8080/myproject/actor/take/154/";
adding a little error handling to handle missing "/" like
String url = "localhost:8080/myproject/reader/add/1";
String anotherurl = "localhost:8080/myproject/actor/take/154";
String number = "";
if(url.endsWith("/") {
String[] urlComps = url.split("/");
number = urlComps[urlComps.length-1]; //last item before the last slash
} else {
number = url.substring(url.lastIndexOf("/")+1, url.length());
}
In One Line :
String num = (num=url.substring(0, url.length() - 1)).substring(num.lastIndexOf('/')+1,num.length());
