Pattern UNICODE_CASE field in Java with Examples


Enables Unicode-aware case folding. When you use this as flag value to the compile() method along with the CASE_INSENSITIVE flag and if you search for Unicode characters using regular expressions Unicode characters of both cases will be matched.

Example

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class UNICODE_CASE_Example {
   public static void main( String args[] ) {
      String regex = "\u00de";
      //Compiling the regular expression
      Pattern pattern = Pattern.compile(regex, Pattern.UNICODE_CASE|Pattern.CASE_INSENSITIVE);
      //Retrieving the matcher object
      String str[] = {"\u00de", "\u00fe", "\u00ee", "\u00ce"};
      for (String ele : str) {
         Matcher matcher = pattern.matcher(ele);
         if(matcher.matches()) {
            System.out.println(ele+" is a match for "+regex);
         } else {
            System.out.println(ele+" is not a match for "+regex);
         }
      }
   }
}

Output

? is a match for ?
? is a match for ?
? is not a match for ?
? is not a match for ? 

Updated on: 07-Dec-2023

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