Question

i am new to regular expressions in Java. I like to extract a string by using regular expressions.

This is my String: “Hello,World”

I like to extract the text after “,”. The result would be “World”. I tried this:

final Pattern pattern = Pattern.compile(",(.+?)"); 
final Matcher matcher = pattern.matcher("Hello,World"); 
matcher.find(); 

But what would be the next step?

Answer 1

You don’t need Regex for this. You can simply split on comma and get the 2nd element from the array: –

System.out.println("Hello,World".split(",")[1]);

OUTPUT: –

World

---

But if you want to use Regex, you need to remove ? from your Regex.

? after + is used for Reluctant matching. It will only match W and stop there.
You don’t need that here. You need to match until it can match.

So use greedy matching instead.

Here’s the code with modified Regex: –

final Pattern pattern = Pattern.compile(",(.+)"); 
final Matcher matcher = pattern.matcher("Hello,World"); 

if (matcher.find()) {
    System.out.println(matcher.group(1));
}

OUTPUT: –

World