1. Match 3 or More Occurrences Using {n,}
This program demonstrates the {n,} quantifier in Java regular expressions. The {n,} matches n or more consecutive occurrences of the preceding character or group. Here, {3,} matches three or more consecutive a characters.
import java.util.regex.*;
public class NOrMoreOccurrences {
public static void main(String[] args) {
String input = "aa aaa aaaa aa";
Pattern pattern = Pattern.compile("a{3,}");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) {
System.out.println("Matched: " + matcher.group());
}
}
}Output:
Matched: aaa
Matched: aaaa2. Match 2 or More Digits Using {n,}
This program uses {2,} to match two or more consecutive digits. It matches groups containing at least two digits. Groups containing only one digit are not matched.
import java.util.regex.*;
public class TwoOrMoreDigits {
public static void main(String[] args) {
String input = "1 12 123 4567";
Pattern pattern = Pattern.compile("\\d{2,}");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) {
System.out.println("Matched: " + matcher.group());
}
}
}Output:
Matched: 12
Matched: 123
Matched: 4567