Character Class [a-z&&[def]] Match

Description

The character class [a-z&&[def]] matches d,e or f.

Example

The following example shows the usage of character class matching.

package com.tutorialspoint;

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

public class CharacterClassDemo {
   private static final String REGEX = "[a-z&&[def]]";
   private static final String INPUT = "dbcabca124ADCmnbc";

   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