regex to match only number with n digit
^[0-9]*$
import java.util.regex.Matcher;
import java.util.regex.Pattern;
final String regex = "^[0-9]*$";
final String string = "12333\n" + "sgd123\n" + "sefgwer46546\n" + "486464se\n" + "486464545656";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println( System.out.println( System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println( System.out.println( System.out.println("Group " + i + ": " + matcher.group(i));
} } } }
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