Check whether a URL contains any parameter or not using a regular expression

Question

How do I check whether any URL contains one or more parameters or not?

For example, if the URL is

.../PaymentGatewayManager?mode=5015

then we should be able to know that URL contains one parameter. Or if the URL is

.../PaymentGatewayManager

then we should be able to know that the URL does not contain any parameter. Or if the URL is

.../PaymentGatewayManager?mode=5015&test=456123&abc=78

then we should be able to know that the URL contains three parameters, and we should also be able to know the parameter name and values of that using any regular expression in Java.

Can you please check this [url][1] [1]: http://stackoverflow.com/questions/27745/getting-parts-of-a-url-regex Hope that is your answer — Sandeep Nair, Feb 03 '12 at 11:13

score 4 · Accepted Answer · edited Jul 10 '13 at 08:02

If you wanted to do it with a regular expression (this can be optimized as well to do a search inside a group):

public static void main(String[] args) {
    String input = ".../PaymentGatewayManager?mode=5015&test=456123&test2=SomeRandomValue&abc=78";
    if(input.contains("?")){
        System.out.println("It does contain parameters");
        input = "&" + input.substring(input.indexOf("?")+1) + "&";

        System.out.println(input);

        Pattern p = Pattern.compile("&?(\\w.+?)=(.+?)&");
        Matcher m = p.matcher(input);

        while(m.find()){
            System.out.println("Token ->" + m.group(1));
            System.out.println("Value ->" + m.group(2));
        }
    }
}

score 3 · Answer 2 · 2012-02-03T11:12:47.007

3

Use the methods of java.net.URI to get everything about an URL.

Edit: Use URI, not URL (thanks McDowell).

edited Feb 03 '12 at 11:12

answered Feb 03 '12 at 11:04

3

Use `java.net.URI` for string manipulation; some `URL` methods cause network I/O. – McDowell Feb 03 '12 at 11:11

score 2 · Answer 3 · answered Feb 03 '12 at 11:11

You can String.split() the URL, or tokenize it using java.util.StringTokenizer, using ? as the splitter character. If you get more than one pieces, then it's sure that the URL contains parameters.

To get the parameters, split the second part by & in the same way. You'll get the parameters. Splitting each one of them by = will give you the names and values.

Check whether a URL contains any parameter or not using a regular expression

3 Answers3