1. Match One or More Occurrences Using +
This program demonstrates the + quantifier in Java regular expressions. The + matches one or more consecutive occurrences of the preceding character or group. Unlike *, it does not match when the character occurs zero times.
import java.util.regex.*;
public class OneOrMoreMatch {
public static void main(String[] args) {
String input = "aaab";
Pattern pattern = Pattern.compile("a+");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) {
System.out.println("Matched: " + matcher.group());
}
}
}Output:
Matched: aaa2. Match Repeated Characters Using +
This program uses + to find one or more consecutive occurrences of the character b. It matches groups containing one or more b characters. It does not produce an empty match when b is absent.
import java.util.regex.*;
public class RepeatedCharacterPlus {
public static void main(String[] args) {
String input = "abbcbb";
Pattern pattern = Pattern.compile("b+");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) {
System.out.println("Matched: " + matcher.group());
}
}
}Output:
Matched: bb
Matched: bb