Creating regex to extract 4 digit number from string using java

Question

Hi I am trying to build one regex to extract 4 digit number from given string using java. I tried it in following ways:

String mydata = \"get the 0025 data f         


        

Answer 1

Many better answers, but if you still have to use in the same way.

String mydata = "get the 0025 data from string";
Pattern pattern = Pattern.compile("(?<![-.])\\b[0-9]+\\b(?!\\.[0-9])");
Matcher matcher = pattern.matcher(mydata);
String val = "";
    if (matcher.find()) {
        System.out.println(matcher.group(0));

        val = matcher.group(0);
    }

changed matcher.group(1); to matcher.group(0);