Question

public String getContextName() {
    String contextName = FacesContext.getCurrentInstance()
                         .getExternalContext().getRequestContextPath();
    String uri = "localhost/gar/garmin-first/gar_home";
    Pattern pat=Pattern.compile("/(.*?)/(.*)/");
    Matcher matcher = pat.matcher(uri);
    matcher.find();
    System.out.println("matched"+matcher.group(1)+matcher.group(2));
    if (StringUtil.isNotEmpty(contextName) && 
        contextName.contains(matcher.group(1))) {

        return matcher.group(2);
    }
    return matcher.group(1);
}

The output in the console will be printed as group(1) = gar,and group(2) = garmin-first, but what I really need is one regular expression that can work for both the cases. The other case is:

String uri = "localhost/garmin-first/gar_home";

In this case I need the output as group(1) = garmin-first and group(2) should be left empty. Can you please help me out
with a regular expression that can work for both the cases please.

Answer 1

package test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test1
{
    public static void main(String[] args)
    {
        String[] strings = new String[]
        { "localhost/gar/garmin-first/gar_home", "localhost/garmin-first/gar_home" };
        Pattern pat = Pattern.compile("(?<=/)(.*?)(?=/)");
        for(String s : strings)
        {
            System.out.println("For: " + s);
            Matcher matcher = pat.matcher(s);
            while (matcher.find())
            {
                System.out.println(matcher.group());
            }
        }
    }
}

I’ve changed the regex subtly so that we are looking for words that are surrounded by “/”.
Hopefully you can find a useful way to get the parts you need because I don’t think .group(1) and .group(2) will work now that we are looking for multiple matches in the same string.