Hi there, Where's my code wrong? It didn't pass validation. btw. I was looking for the appropriate REGEX for this taks with the following conditions: * 1 dollar must be replaced by one dollar * dollar 1 must be replaced by dollar one * 1dollar must not be replaced * dollar1 must not be replaced I worked with the INTERNET page" https://regex101.com/" to see if my REGEX ("[^a-z^A-Z]\d+) worked and it did, In fact I copy the proposed code(*) by regex101 :to my IntelIiJ IDEA and it worked as expected however the same REGEX in the code of this task failed.???? (*)
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Example {
    public static void main(String[] args) {
        final String regex = "[^A-Z^a-z]\\d+";
        final String string = "This costs 1 dollar, but this is 12.\n"
	 + "The variable is called file1.\n"
	 + "110 is a number.\n"
	 + "1 dollar is the cost of 1 pigrim";

        final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
        final Matcher matcher = pattern.matcher(string);

        while (matcher.find()) {
            System.out.println("Full match: " + matcher.group(0));

            for (int i = 1; i <= matcher.groupCount(); i++) {
                System.out.println("Group " + i + ": " + matcher.group(i));
Surfing through the help I saw this new REGEX ("\\b\\d+\\b"), I checked it and it seems to be working but my code again didn't pass validation. Thanks