Use a character set : Pattern « Regular Expressions « Java

1. Java
2. Regular Expressions
3. Pattern

Use a character set

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

public class Main {
  public static void main(String[] argv) throws Exception {

    CharSequence inputStr = "Abc";
    String patternStr = "abc";

    // Compile with case-insensitivity
    Pattern pattern = Pattern.compile(patternStr, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    boolean matchFound = matcher.matches(); 

    matchFound = pattern.matches("[a-c]+", "aBc"); 
    matchFound = pattern.matches("(?i)[a-c]+", "aBc"); 

  }
}

   
  

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