Java Regex - Greedy Quantifier [X?] Match


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Description

The Greedy Quantifier [X?] matches the X present once or not present at all.

Example

The following example shows the usage of greedy quantifier.

package com.tutorialspoint;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GreedyQuantifierDemo {
   private static final String REGEX = "T?";
   private static final String INPUT = "abcdTatW";

   public static void main(String[] args) {
      // create a pattern
      Pattern  pattern = Pattern.compile(REGEX);
      
      // get a matcher object
      Matcher matcher = pattern.matcher(INPUT); 

      while(matcher.find()) {
         //Prints the start index of the match.
         System.out.println("Match String start(): "+matcher.start());
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Match String start(): 0
Match String start(): 1
Match String start(): 2
Match String start(): 3
Match String start(): 4
Match String start(): 5
Match String start(): 6
Match String start(): 7
Match String start(): 8
javaregex_greeddy_quantifiers.htm
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